diff --git a/01-rstudio-intro.html b/01-rstudio-intro.html
index eacf1b43c..9c377d8af 100644
--- a/01-rstudio-intro.html
+++ b/01-rstudio-intro.html
@@ -1438,7 +1438,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
   "identifier": "https://UCL.github.io/ClinicianCoders/01-rstudio-intro.html",
   "dateCreated": "2023-10-26",
   "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/02-project-intro.html b/02-project-intro.html
index 583b8c08e..ebb549f99 100644
--- a/02-project-intro.html
+++ b/02-project-intro.html
@@ -790,7 +790,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
   "identifier": "https://UCL.github.io/ClinicianCoders/02-project-intro.html",
   "dateCreated": "2023-10-26",
   "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/03-seeking-help.html b/03-seeking-help.html
index 7d35fdf47..0520ab85b 100644
--- a/03-seeking-help.html
+++ b/03-seeking-help.html
@@ -598,7 +598,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Solution to Challenge 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>The <code>c()</code> function creates a vector, in which all elements
 are of the same type. In the first case, the elements are numeric, in
@@ -629,7 +629,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Solution to Challenge 2
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <p>To look at the help for the <code>paste()</code> function, use:</p>
 <div class="codewrapper sourceCode" id="cb11">
@@ -739,7 +739,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Solution to Challenge 3
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <p>The standard R function for reading tab-delimited files with a period
 decimal separator is read.delim(). You can also do this with
@@ -829,7 +829,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
   "identifier": "https://UCL.github.io/ClinicianCoders/03-seeking-help.html",
   "dateCreated": "2023-10-26",
   "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/04-data-structures-part1.html b/04-data-structures-part1.html
index 8cd9588b3..ff2f8ba04 100644
--- a/04-data-structures-part1.html
+++ b/04-data-structures-part1.html
@@ -818,7 +818,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Discussion 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>By keeping everything in a column the same, we allow ourselves to
 make simple assumptions about our data; if you can interpret one entry
@@ -1045,7 +1045,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Tip 1.1
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <p>Show the content of any variable by typing its name.</p>
 <div class="section level3">
@@ -1079,7 +1079,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Tip 1.2
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <p>In the chapter “Data types” we saw two functions that can show data
 types. One printed just a single word, the data type name. The other
@@ -1120,7 +1120,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Tip 1.3
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <p>Scroll up to the section about the <a href="#the-type-hierarchy">type
 hierarchy</a> to review the available data types</p>
@@ -1135,7 +1135,7 @@ <h4 class="accordion-header" id="headingSolution5">
   Solution to Challenge 1.3
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
 <div class="accordion-body">
 <ul><li>Weight is expressed on a continuous scale (real numbers). The R data
 type for this is “double” (also known as “numeric”).</li>
@@ -1169,7 +1169,7 @@ <h4 class="accordion-header" id="headingSolution6">
   Tip 1.4
   </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
 <div class="accordion-body">
 <p>Revisit the hierarchy of data types when two different data types are
 combined.</p>
@@ -1209,7 +1209,7 @@ <h4 class="accordion-header" id="headingSolution7">
   Tip 1.5
   </h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
+<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
 <div class="accordion-body">
 <p>The functions to convert data types start with <code>as.</code>. You
 can look for the function further up in the manuscript or use the
@@ -1401,7 +1401,7 @@ <h4 class="accordion-header" id="headingSolution8">
   Solution to Challenge 2
   </h4>
 </button>
-<div id="collapseSolution8" class="accordion-collapse collapse" aria-labelledby="headingSolution8" data-bs-parent="#accordionSolution8">
+<div id="collapseSolution8" class="accordion-collapse collapse" data-bs-parent="#accordionSolution8" aria-labelledby="headingSolution8">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb92">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1627,7 +1627,7 @@ <h4 class="accordion-header" id="headingSolution9">
   Solution to Challenge 3
   </h4>
 </button>
-<div id="collapseSolution9" class="accordion-collapse collapse" aria-labelledby="headingSolution9" data-bs-parent="#accordionSolution9">
+<div id="collapseSolution9" class="accordion-collapse collapse" data-bs-parent="#accordionSolution9" aria-labelledby="headingSolution9">
 <div class="accordion-body">
 <p>You get the names of an object by wrapping the object name inside
 <code>names(...)</code>. Similarly, you get the data type of the names
@@ -1672,7 +1672,7 @@ <h4 class="accordion-header" id="headingSolution10">
   Solution to Challenge 4
   </h4>
 </button>
-<div id="collapseSolution10" class="accordion-collapse collapse" aria-labelledby="headingSolution10" data-bs-parent="#accordionSolution10">
+<div id="collapseSolution10" class="accordion-collapse collapse" data-bs-parent="#accordionSolution10" aria-labelledby="headingSolution10">
 <div class="accordion-body">
 <pre><code><span><span class="va">letter_no</span> <span class="op">&lt;-</span> <span class="fl">1</span><span class="op">:</span><span class="fl">26</span>   <span class="co"># or seq(1,26)</span></span>
 <span><span class="fu">names</span><span class="op">(</span><span class="va">letter_no</span><span class="op">)</span> <span class="op">&lt;-</span> <span class="va">LETTERS</span></span>
@@ -1862,7 +1862,7 @@ <h4 class="accordion-header" id="headingSolution11">
   Solution to Challenge 5
   </h4>
 </button>
-<div id="collapseSolution11" class="accordion-collapse collapse" aria-labelledby="headingSolution11" data-bs-parent="#accordionSolution11">
+<div id="collapseSolution11" class="accordion-collapse collapse" data-bs-parent="#accordionSolution11" aria-labelledby="headingSolution11">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb138">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -2124,7 +2124,7 @@ <h4 class="accordion-header" id="headingSolution12">
   Solution to Challenge 6
   </h4>
 </button>
-<div id="collapseSolution12" class="accordion-collapse collapse" aria-labelledby="headingSolution12" data-bs-parent="#accordionSolution12">
+<div id="collapseSolution12" class="accordion-collapse collapse" data-bs-parent="#accordionSolution12" aria-labelledby="headingSolution12">
 <div class="accordion-body">
 <p>What do you think will be the result of
 <code>length(matrix_example)</code>?</p>
@@ -2170,7 +2170,7 @@ <h4 class="accordion-header" id="headingSolution13">
   Solution to Challenge 7
   </h4>
 </button>
-<div id="collapseSolution13" class="accordion-collapse collapse" aria-labelledby="headingSolution13" data-bs-parent="#accordionSolution13">
+<div id="collapseSolution13" class="accordion-collapse collapse" data-bs-parent="#accordionSolution13" aria-labelledby="headingSolution13">
 <div class="accordion-body">
 <p>Make another matrix, this time containing the numbers 1:50, with 5
 columns and 10 rows. Did the <code>matrix</code> function fill your
@@ -2212,7 +2212,7 @@ <h4 class="accordion-header" id="headingSolution14">
   Solution to Challenge 8
   </h4>
 </button>
-<div id="collapseSolution14" class="accordion-collapse collapse" aria-labelledby="headingSolution14" data-bs-parent="#accordionSolution14">
+<div id="collapseSolution14" class="accordion-collapse collapse" data-bs-parent="#accordionSolution14" aria-labelledby="headingSolution14">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb173">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -2264,7 +2264,7 @@ <h4 class="accordion-header" id="headingSolution15">
   Solution to Challenge 9
   </h4>
 </button>
-<div id="collapseSolution15" class="accordion-collapse collapse" aria-labelledby="headingSolution15" data-bs-parent="#accordionSolution15">
+<div id="collapseSolution15" class="accordion-collapse collapse" data-bs-parent="#accordionSolution15" aria-labelledby="headingSolution15">
 <div class="accordion-body">
 <p>Consider the R output of the matrix below:</p>
 <div class="codewrapper">
@@ -2365,7 +2365,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
   "identifier": "https://UCL.github.io/ClinicianCoders/04-data-structures-part1.html",
   "dateCreated": "2023-10-26",
   "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/05-data-structures-part2.html b/05-data-structures-part2.html
index 8642c6c0a..854d09fb5 100644
--- a/05-data-structures-part2.html
+++ b/05-data-structures-part2.html
@@ -683,7 +683,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Solution to Challenge 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb30">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -968,7 +968,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Solution to Challenge 2
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <p>To check the last few lines it’s relatively simple as R already has a
 function for this:</p>
@@ -1029,7 +1029,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Solution to Challenge 3
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>The <code>source</code> function can be used to use a script within a
 script. Assume you would like to load the same type of file over and
@@ -1082,7 +1082,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Solution to Challenge 4
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <p>The object <code>gapminder</code> is a data frame with columns</p>
 <ul><li>
@@ -1178,7 +1178,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
   "identifier": "https://UCL.github.io/ClinicianCoders/05-data-structures-part2.html",
   "dateCreated": "2023-10-26",
   "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/06-data-subsetting.html b/06-data-subsetting.html
index 5270a96ef..e2170326b 100644
--- a/06-data-subsetting.html
+++ b/06-data-subsetting.html
@@ -696,7 +696,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Solution to challenge 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb34">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -885,7 +885,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Solution to challenge 2
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb50">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1140,7 +1140,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Solution to challenge 3
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <ul><li>The <strong>wrong</strong> way to do this problem is
 <code>countries==seAsia</code>. This gives a warning
@@ -1423,7 +1423,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Solution to challenge 4
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <p>D</p>
 </div>
@@ -1570,7 +1570,7 @@ <h4 class="accordion-header" id="headingSolution5">
   Solution to challenge 5
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb115">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1636,7 +1636,7 @@ <h4 class="accordion-header" id="headingSolution6">
   Solution to challenge 6
   </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb122">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1792,7 +1792,7 @@ <h4 class="accordion-header" id="headingSolution7">
   Solution to challenge 7
   </h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
+<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
 <div class="accordion-body">
 <p>Fix each of the following common data frame subsetting errors:</p>
 <ol style="list-style-type: decimal"><li>Extract observations collected for the year 1957</li>
@@ -1866,7 +1866,7 @@ <h4 class="accordion-header" id="headingSolution8">
   Solution to challenge 8
   </h4>
 </button>
-<div id="collapseSolution8" class="accordion-collapse collapse" data-bs-parent="#accordionSolution8" aria-labelledby="headingSolution8">
+<div id="collapseSolution8" class="accordion-collapse collapse" aria-labelledby="headingSolution8" data-bs-parent="#accordionSolution8">
 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li><p><code>gapminder</code> is a data.frame so needs to be subsetted
 on two dimensions. <code>gapminder[1:20, ]</code> subsets the data to
@@ -1960,7 +1960,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
   "identifier": "https://UCL.github.io/ClinicianCoders/06-data-subsetting.html",
   "dateCreated": "2023-10-26",
   "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/07-control-flow.html b/07-control-flow.html
index 67424632a..edc46c646 100644
--- a/07-control-flow.html
+++ b/07-control-flow.html
@@ -1216,7 +1216,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
   "identifier": "https://UCL.github.io/ClinicianCoders/07-control-flow.html",
   "dateCreated": "2023-10-26",
   "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/08-plot-ggplot2.html b/08-plot-ggplot2.html
index 236731c9d..e4e1398fb 100644
--- a/08-plot-ggplot2.html
+++ b/08-plot-ggplot2.html
@@ -496,7 +496,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Solution to challenge 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <p>Here is one possible solution:</p>
 <div class="codewrapper sourceCode" id="cb5">
@@ -537,7 +537,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Solution to challenge 2
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <p>The solution presented below adds <code>color=continent</code> to the
 call of the <code>aes</code> function. The general trend seems to
@@ -649,7 +649,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Solution to challenge 3
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>The lines now get drawn over the points!</p>
 <div class="codewrapper sourceCode" id="cb11">
@@ -781,7 +781,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Solution to challenge 4a
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <p>Here a possible solution: Notice that the <code>color</code> argument
 is supplied outside of the <code>aes()</code> function. This means that
@@ -825,7 +825,7 @@ <h4 class="accordion-header" id="headingSolution5">
   Solution to challenge 4b
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
 <div class="accordion-body">
 <p>Here is a possible solution: Notice that supplying the
 <code>color</code> argument inside the <code>aes()</code> functions
@@ -979,7 +979,7 @@ <h4 class="accordion-header" id="headingSolution6">
   Solution to Challenge 5
   </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
 <div class="accordion-body">
 <p>Here a possible solution: <code>xlab()</code> and <code>ylab()</code>
 set labels for the x and y axes, respectively The axis title, text and
@@ -1074,7 +1074,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
   "identifier": "https://UCL.github.io/ClinicianCoders/08-plot-ggplot2.html",
   "dateCreated": "2023-10-26",
   "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/09-vectorization.html b/09-vectorization.html
index f8e0147b6..5e9d798fb 100644
--- a/09-vectorization.html
+++ b/09-vectorization.html
@@ -468,7 +468,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Solution to challenge 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <p>Let’s try this on the <code>pop</code> column of the
 <code>gapminder</code> dataset.</p>
@@ -520,7 +520,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Solution to challenge 2
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <p>Refresh your plotting skills by plotting population in millions
 against year.</p>
@@ -699,7 +699,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Solution to challenge 3
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>Given the following matrix:</p>
 <div class="codewrapper sourceCode" id="cb28">
@@ -778,7 +778,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Challenge 4
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <p>We’re interested in looking at the sum of the following sequence of
 fractions:</p>
@@ -989,7 +989,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
   "identifier": "https://UCL.github.io/ClinicianCoders/09-vectorization.html",
   "dateCreated": "2023-10-26",
   "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/10-functions.html b/10-functions.html
index 39bd8f786..ceff539af 100644
--- a/10-functions.html
+++ b/10-functions.html
@@ -1190,7 +1190,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
   "identifier": "https://UCL.github.io/ClinicianCoders/10-functions.html",
   "dateCreated": "2023-10-26",
   "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/11-writing-data.html b/11-writing-data.html
index 3e7e7a3bc..0ee7ced31 100644
--- a/11-writing-data.html
+++ b/11-writing-data.html
@@ -441,7 +441,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Solution to challenge 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb3">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -567,7 +567,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Solution to challenge 2
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb11">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -656,7 +656,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
   "identifier": "https://UCL.github.io/ClinicianCoders/11-writing-data.html",
   "dateCreated": "2023-10-26",
   "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/12-plyr.html b/12-plyr.html
index 9dbc80e4a..6892826a1 100644
--- a/12-plyr.html
+++ b/12-plyr.html
@@ -980,7 +980,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
   "identifier": "https://UCL.github.io/ClinicianCoders/12-plyr.html",
   "dateCreated": "2023-10-26",
   "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/13-dplyr.html b/13-dplyr.html
index d57359fe6..e652c6d89 100644
--- a/13-dplyr.html
+++ b/13-dplyr.html
@@ -1208,7 +1208,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
   "identifier": "https://UCL.github.io/ClinicianCoders/13-dplyr.html",
   "dateCreated": "2023-10-26",
   "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/14-tidyr.html b/14-tidyr.html
index 94fc286b5..2aa2d7407 100644
--- a/14-tidyr.html
+++ b/14-tidyr.html
@@ -1129,7 +1129,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
   "identifier": "https://UCL.github.io/ClinicianCoders/14-tidyr.html",
   "dateCreated": "2023-10-26",
   "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/15-knitr-markdown.html b/15-knitr-markdown.html
index 448787507..8f8e102dd 100644
--- a/15-knitr-markdown.html
+++ b/15-knitr-markdown.html
@@ -908,7 +908,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
   "identifier": "https://UCL.github.io/ClinicianCoders/15-knitr-markdown.html",
   "dateCreated": "2023-10-26",
   "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/16-wrap-up.html b/16-wrap-up.html
index 7e37a0376..a0e5ae415 100644
--- a/16-wrap-up.html
+++ b/16-wrap-up.html
@@ -556,7 +556,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
   "identifier": "https://UCL.github.io/ClinicianCoders/16-wrap-up.html",
   "dateCreated": "2023-10-26",
   "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/404.html b/404.html
index a9fef3921..7d9aacfb8 100644
--- a/404.html
+++ b/404.html
@@ -419,8 +419,8 @@ <h1>Page not found</h1>
   "url": "https://UCL.github.io/ClinicianCoders/404.html",
   "identifier": "https://UCL.github.io/ClinicianCoders/404.html",
   "dateCreated": "2023-10-26",
-  "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "dateModified": "2023-11-22",
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/CODE_OF_CONDUCT.html b/CODE_OF_CONDUCT.html
index dd332b580..f1663b9a3 100644
--- a/CODE_OF_CONDUCT.html
+++ b/CODE_OF_CONDUCT.html
@@ -419,7 +419,7 @@ <h1>Contributor Code of Conduct</h1>
   "identifier": "https://UCL.github.io/ClinicianCoders/CODE_OF_CONDUCT.html",
   "dateCreated": "2023-10-26",
   "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/LICENSE.html b/LICENSE.html
index 8462c26d8..6c01f3b1f 100644
--- a/LICENSE.html
+++ b/LICENSE.html
@@ -470,7 +470,7 @@ <h1>Licenses</h1>
   "identifier": "https://UCL.github.io/ClinicianCoders/LICENSE.html",
   "dateCreated": "2023-10-26",
   "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/aio.html b/aio.html
index 622bccb72..047d51a89 100644
--- a/aio.html
+++ b/aio.html
@@ -2129,7 +2129,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Solution to Challenge 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>The <code>c()</code> function creates a vector, in which all elements
 are of the same type. In the first case, the elements are numeric, in
@@ -2160,7 +2160,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Solution to Challenge 2
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <p>To look at the help for the <code>paste()</code> function, use:</p>
 <div class="codewrapper sourceCode" id="cb11">
@@ -2270,7 +2270,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Solution to Challenge 3
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <p>The standard R function for reading tab-delimited files with a period
 decimal separator is read.delim(). You can also do this with
@@ -2777,7 +2777,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Discussion 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>By keeping everything in a column the same, we allow ourselves to
 make simple assumptions about our data; if you can interpret one entry
@@ -3009,7 +3009,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Tip 1.1
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <p>Show the content of any variable by typing its name.</p>
 <div class="section level3">
@@ -3044,7 +3044,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Tip 1.2
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <p>In the chapter “Data types” we saw two functions that can show data
 types. One printed just a single word, the data type name. The other
@@ -3088,7 +3088,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Tip 1.3
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <p>Scroll up to the section about the <a href="#the-type-hierarchy">type
 hierarchy</a> to review the available data types</p>
@@ -3103,7 +3103,7 @@ <h4 class="accordion-header" id="headingSolution5">
   Solution to Challenge 1.3
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
 <div class="accordion-body">
 <ul>
 <li>Weight is expressed on a continuous scale (real numbers). The R data
@@ -3139,7 +3139,7 @@ <h4 class="accordion-header" id="headingSolution6">
   Tip 1.4
   </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
 <div class="accordion-body">
 <p>Revisit the hierarchy of data types when two different data types are
 combined.</p>
@@ -3180,7 +3180,7 @@ <h4 class="accordion-header" id="headingSolution7">
   Tip 1.5
   </h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
+<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
 <div class="accordion-body">
 <p>The functions to convert data types start with <code>as.</code>. You
 can look for the function further up in the manuscript or use the
@@ -3373,7 +3373,7 @@ <h4 class="accordion-header" id="headingSolution8">
   Solution to Challenge 2
   </h4>
 </button>
-<div id="collapseSolution8" class="accordion-collapse collapse" aria-labelledby="headingSolution8" data-bs-parent="#accordionSolution8">
+<div id="collapseSolution8" class="accordion-collapse collapse" data-bs-parent="#accordionSolution8" aria-labelledby="headingSolution8">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb92">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -3605,7 +3605,7 @@ <h4 class="accordion-header" id="headingSolution9">
   Solution to Challenge 3
   </h4>
 </button>
-<div id="collapseSolution9" class="accordion-collapse collapse" aria-labelledby="headingSolution9" data-bs-parent="#accordionSolution9">
+<div id="collapseSolution9" class="accordion-collapse collapse" data-bs-parent="#accordionSolution9" aria-labelledby="headingSolution9">
 <div class="accordion-body">
 <p>You get the names of an object by wrapping the object name inside
 <code>names(...)</code>. Similarly, you get the data type of the names
@@ -3652,7 +3652,7 @@ <h4 class="accordion-header" id="headingSolution10">
   Solution to Challenge 4
   </h4>
 </button>
-<div id="collapseSolution10" class="accordion-collapse collapse" aria-labelledby="headingSolution10" data-bs-parent="#accordionSolution10">
+<div id="collapseSolution10" class="accordion-collapse collapse" data-bs-parent="#accordionSolution10" aria-labelledby="headingSolution10">
 <div class="accordion-body">
 <pre><code><span><span class="va">letter_no</span> <span class="op">&lt;-</span> <span class="fl">1</span><span class="op">:</span><span class="fl">26</span>   <span class="co"># or seq(1,26)</span></span>
 <span><span class="fu">names</span><span class="op">(</span><span class="va">letter_no</span><span class="op">)</span> <span class="op">&lt;-</span> <span class="va">LETTERS</span></span>
@@ -3845,7 +3845,7 @@ <h4 class="accordion-header" id="headingSolution11">
   Solution to Challenge 5
   </h4>
 </button>
-<div id="collapseSolution11" class="accordion-collapse collapse" aria-labelledby="headingSolution11" data-bs-parent="#accordionSolution11">
+<div id="collapseSolution11" class="accordion-collapse collapse" data-bs-parent="#accordionSolution11" aria-labelledby="headingSolution11">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb138">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -4108,7 +4108,7 @@ <h4 class="accordion-header" id="headingSolution12">
   Solution to Challenge 6
   </h4>
 </button>
-<div id="collapseSolution12" class="accordion-collapse collapse" aria-labelledby="headingSolution12" data-bs-parent="#accordionSolution12">
+<div id="collapseSolution12" class="accordion-collapse collapse" data-bs-parent="#accordionSolution12" aria-labelledby="headingSolution12">
 <div class="accordion-body">
 <p>What do you think will be the result of
 <code>length(matrix_example)</code>?</p>
@@ -4154,7 +4154,7 @@ <h4 class="accordion-header" id="headingSolution13">
   Solution to Challenge 7
   </h4>
 </button>
-<div id="collapseSolution13" class="accordion-collapse collapse" aria-labelledby="headingSolution13" data-bs-parent="#accordionSolution13">
+<div id="collapseSolution13" class="accordion-collapse collapse" data-bs-parent="#accordionSolution13" aria-labelledby="headingSolution13">
 <div class="accordion-body">
 <p>Make another matrix, this time containing the numbers 1:50, with 5
 columns and 10 rows. Did the <code>matrix</code> function fill your
@@ -4198,7 +4198,7 @@ <h4 class="accordion-header" id="headingSolution14">
   Solution to Challenge 8
   </h4>
 </button>
-<div id="collapseSolution14" class="accordion-collapse collapse" aria-labelledby="headingSolution14" data-bs-parent="#accordionSolution14">
+<div id="collapseSolution14" class="accordion-collapse collapse" data-bs-parent="#accordionSolution14" aria-labelledby="headingSolution14">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb173">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -4252,7 +4252,7 @@ <h4 class="accordion-header" id="headingSolution15">
   Solution to Challenge 9
   </h4>
 </button>
-<div id="collapseSolution15" class="accordion-collapse collapse" aria-labelledby="headingSolution15" data-bs-parent="#accordionSolution15">
+<div id="collapseSolution15" class="accordion-collapse collapse" data-bs-parent="#accordionSolution15" aria-labelledby="headingSolution15">
 <div class="accordion-body">
 <p>Consider the R output of the matrix below:</p>
 <div class="codewrapper">
@@ -4631,7 +4631,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Solution to Challenge 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb30">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -4923,7 +4923,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Solution to Challenge 2
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <p>To check the last few lines it’s relatively simple as R already has a
 function for this:</p>
@@ -4985,7 +4985,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Solution to Challenge 3
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>The <code>source</code> function can be used to use a script within a
 script. Assume you would like to load the same type of file over and
@@ -5038,7 +5038,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Solution to Challenge 4
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <p>The object <code>gapminder</code> is a data frame with columns</p>
 <ul>
@@ -5418,7 +5418,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Solution to challenge 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb34">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -5613,7 +5613,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Solution to challenge 2
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb50">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -5870,7 +5870,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Solution to challenge 3
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <ul>
 <li>The <strong>wrong</strong> way to do this problem is
@@ -6163,7 +6163,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Solution to challenge 4
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <p>D</p>
 </div>
@@ -6311,7 +6311,7 @@ <h4 class="accordion-header" id="headingSolution5">
   Solution to challenge 5
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb115">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -6377,7 +6377,7 @@ <h4 class="accordion-header" id="headingSolution6">
   Solution to challenge 6
   </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb122">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -6544,7 +6544,7 @@ <h4 class="accordion-header" id="headingSolution7">
   Solution to challenge 7
   </h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
+<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
 <div class="accordion-body">
 <p>Fix each of the following common data frame subsetting errors:</p>
 <ol style="list-style-type: decimal">
@@ -6630,7 +6630,7 @@ <h4 class="accordion-header" id="headingSolution8">
   Solution to challenge 8
   </h4>
 </button>
-<div id="collapseSolution8" class="accordion-collapse collapse" data-bs-parent="#accordionSolution8" aria-labelledby="headingSolution8">
+<div id="collapseSolution8" class="accordion-collapse collapse" aria-labelledby="headingSolution8" data-bs-parent="#accordionSolution8">
 <div class="accordion-body">
 <ol style="list-style-type: decimal">
 <li><p><code>gapminder</code> is a data.frame so needs to be subsetted
@@ -7625,7 +7625,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Solution to challenge 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <p>Here is one possible solution:</p>
 <div class="codewrapper sourceCode" id="cb5">
@@ -7667,7 +7667,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Solution to challenge 2
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <p>The solution presented below adds <code>color=continent</code> to the
 call of the <code>aes</code> function. The general trend seems to
@@ -7781,7 +7781,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Solution to challenge 3
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>The lines now get drawn over the points!</p>
 <div class="codewrapper sourceCode" id="cb11">
@@ -7915,7 +7915,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Solution to challenge 4a
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <p>Here a possible solution: Notice that the <code>color</code> argument
 is supplied outside of the <code>aes()</code> function. This means that
@@ -7960,7 +7960,7 @@ <h4 class="accordion-header" id="headingSolution5">
   Solution to challenge 4b
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
 <div class="accordion-body">
 <p>Here is a possible solution: Notice that supplying the
 <code>color</code> argument inside the <code>aes()</code> functions
@@ -8120,7 +8120,7 @@ <h4 class="accordion-header" id="headingSolution6">
   Solution to Challenge 5
   </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
 <div class="accordion-body">
 <p>Here a possible solution: <code>xlab()</code> and <code>ylab()</code>
 set labels for the x and y axes, respectively The axis title, text and
@@ -8284,7 +8284,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Solution to challenge 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <p>Let’s try this on the <code>pop</code> column of the
 <code>gapminder</code> dataset.</p>
@@ -8336,7 +8336,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Solution to challenge 2
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <p>Refresh your plotting skills by plotting population in millions
 against year.</p>
@@ -8518,7 +8518,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Solution to challenge 3
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>Given the following matrix:</p>
 <div class="codewrapper sourceCode" id="cb28">
@@ -8603,7 +8603,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Challenge 4
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <p>We’re interested in looking at the sum of the following sequence of
 fractions:</p>
@@ -9635,7 +9635,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Solution to challenge 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb3">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -9762,7 +9762,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Solution to challenge 2
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb11">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -12623,8 +12623,8 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
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   "identifier": "https://UCL.github.io/ClinicianCoders/aio.html",
   "dateCreated": "2023-10-26",
-  "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "dateModified": "2023-11-22",
+  "datePublished": "2023-11-22"
 }
 
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diff --git a/discuss.html b/discuss.html
index b0458b54e..2eefc7272 100644
--- a/discuss.html
+++ b/discuss.html
@@ -413,7 +413,7 @@ <h1>Discussion</h1>
   "identifier": "https://UCL.github.io/ClinicianCoders/discuss.html",
   "dateCreated": "2023-10-26",
   "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/images.html b/images.html
index 409b77634..8f50bc765 100644
--- a/images.html
+++ b/images.html
@@ -613,8 +613,8 @@ <h3 id="15-knitr-markdown-figure-3">Figure 3</h3>
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   "identifier": "https://UCL.github.io/ClinicianCoders/images.html",
   "dateCreated": "2023-10-26",
-  "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "dateModified": "2023-11-22",
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/index.html b/index.html
index a14eadf94..672cbe705 100644
--- a/index.html
+++ b/index.html
@@ -432,8 +432,8 @@ <h3 class="callout-title">Prerequisites<a class="anchor" aria-label="anchor" hre
   "url": "https://UCL.github.io/ClinicianCoders/index.html",
   "identifier": "https://UCL.github.io/ClinicianCoders/index.html",
   "dateCreated": "2023-10-26",
-  "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "dateModified": "2023-11-22",
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/instructor-notes.html b/instructor-notes.html
index b12bb1d18..2342d726f 100644
--- a/instructor-notes.html
+++ b/instructor-notes.html
@@ -595,8 +595,8 @@ <h3 class="code-label">BASH<i aria-hidden="true" data-feather="chevron-left"></i
   "url": "https://UCL.github.io/ClinicianCoders/instructor-notes.html",
   "identifier": "https://UCL.github.io/ClinicianCoders/instructor-notes.html",
   "dateCreated": "2023-10-26",
-  "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "dateModified": "2023-11-22",
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/instructor/01-rstudio-intro.html b/instructor/01-rstudio-intro.html
index a8e43cce9..a5f77c614 100644
--- a/instructor/01-rstudio-intro.html
+++ b/instructor/01-rstudio-intro.html
@@ -1439,7 +1439,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
   "identifier": "https://UCL.github.io/ClinicianCoders/instructor/01-rstudio-intro.html",
   "dateCreated": "2023-10-26",
   "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/instructor/02-project-intro.html b/instructor/02-project-intro.html
index f43ee502b..d62437d8f 100644
--- a/instructor/02-project-intro.html
+++ b/instructor/02-project-intro.html
@@ -791,7 +791,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
   "identifier": "https://UCL.github.io/ClinicianCoders/instructor/02-project-intro.html",
   "dateCreated": "2023-10-26",
   "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/instructor/03-seeking-help.html b/instructor/03-seeking-help.html
index 86842ea76..befc40b24 100644
--- a/instructor/03-seeking-help.html
+++ b/instructor/03-seeking-help.html
@@ -599,7 +599,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Solution to Challenge 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>The <code>c()</code> function creates a vector, in which all elements
 are of the same type. In the first case, the elements are numeric, in
@@ -630,7 +630,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Solution to Challenge 2
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <p>To look at the help for the <code>paste()</code> function, use:</p>
 <div class="codewrapper sourceCode" id="cb11">
@@ -740,7 +740,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Solution to Challenge 3
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <p>The standard R function for reading tab-delimited files with a period
 decimal separator is read.delim(). You can also do this with
@@ -830,7 +830,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
   "identifier": "https://UCL.github.io/ClinicianCoders/instructor/03-seeking-help.html",
   "dateCreated": "2023-10-26",
   "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/instructor/04-data-structures-part1.html b/instructor/04-data-structures-part1.html
index 75a2430fc..a19bfd849 100644
--- a/instructor/04-data-structures-part1.html
+++ b/instructor/04-data-structures-part1.html
@@ -819,7 +819,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Discussion 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>By keeping everything in a column the same, we allow ourselves to
 make simple assumptions about our data; if you can interpret one entry
@@ -1046,7 +1046,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Tip 1.1
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <p>Show the content of any variable by typing its name.</p>
 <div class="section level3">
@@ -1080,7 +1080,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Tip 1.2
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <p>In the chapter “Data types” we saw two functions that can show data
 types. One printed just a single word, the data type name. The other
@@ -1121,7 +1121,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Tip 1.3
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <p>Scroll up to the section about the <a href="#the-type-hierarchy">type
 hierarchy</a> to review the available data types</p>
@@ -1136,7 +1136,7 @@ <h4 class="accordion-header" id="headingSolution5">
   Solution to Challenge 1.3
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
 <div class="accordion-body">
 <ul><li>Weight is expressed on a continuous scale (real numbers). The R data
 type for this is “double” (also known as “numeric”).</li>
@@ -1170,7 +1170,7 @@ <h4 class="accordion-header" id="headingSolution6">
   Tip 1.4
   </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
 <div class="accordion-body">
 <p>Revisit the hierarchy of data types when two different data types are
 combined.</p>
@@ -1210,7 +1210,7 @@ <h4 class="accordion-header" id="headingSolution7">
   Tip 1.5
   </h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
+<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
 <div class="accordion-body">
 <p>The functions to convert data types start with <code>as.</code>. You
 can look for the function further up in the manuscript or use the
@@ -1402,7 +1402,7 @@ <h4 class="accordion-header" id="headingSolution8">
   Solution to Challenge 2
   </h4>
 </button>
-<div id="collapseSolution8" class="accordion-collapse collapse" aria-labelledby="headingSolution8" data-bs-parent="#accordionSolution8">
+<div id="collapseSolution8" class="accordion-collapse collapse" data-bs-parent="#accordionSolution8" aria-labelledby="headingSolution8">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb92">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1628,7 +1628,7 @@ <h4 class="accordion-header" id="headingSolution9">
   Solution to Challenge 3
   </h4>
 </button>
-<div id="collapseSolution9" class="accordion-collapse collapse" aria-labelledby="headingSolution9" data-bs-parent="#accordionSolution9">
+<div id="collapseSolution9" class="accordion-collapse collapse" data-bs-parent="#accordionSolution9" aria-labelledby="headingSolution9">
 <div class="accordion-body">
 <p>You get the names of an object by wrapping the object name inside
 <code>names(...)</code>. Similarly, you get the data type of the names
@@ -1673,7 +1673,7 @@ <h4 class="accordion-header" id="headingSolution10">
   Solution to Challenge 4
   </h4>
 </button>
-<div id="collapseSolution10" class="accordion-collapse collapse" aria-labelledby="headingSolution10" data-bs-parent="#accordionSolution10">
+<div id="collapseSolution10" class="accordion-collapse collapse" data-bs-parent="#accordionSolution10" aria-labelledby="headingSolution10">
 <div class="accordion-body">
 <pre><code><span><span class="va">letter_no</span> <span class="op">&lt;-</span> <span class="fl">1</span><span class="op">:</span><span class="fl">26</span>   <span class="co"># or seq(1,26)</span></span>
 <span><span class="fu">names</span><span class="op">(</span><span class="va">letter_no</span><span class="op">)</span> <span class="op">&lt;-</span> <span class="va">LETTERS</span></span>
@@ -1863,7 +1863,7 @@ <h4 class="accordion-header" id="headingSolution11">
   Solution to Challenge 5
   </h4>
 </button>
-<div id="collapseSolution11" class="accordion-collapse collapse" aria-labelledby="headingSolution11" data-bs-parent="#accordionSolution11">
+<div id="collapseSolution11" class="accordion-collapse collapse" data-bs-parent="#accordionSolution11" aria-labelledby="headingSolution11">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb138">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -2125,7 +2125,7 @@ <h4 class="accordion-header" id="headingSolution12">
   Solution to Challenge 6
   </h4>
 </button>
-<div id="collapseSolution12" class="accordion-collapse collapse" aria-labelledby="headingSolution12" data-bs-parent="#accordionSolution12">
+<div id="collapseSolution12" class="accordion-collapse collapse" data-bs-parent="#accordionSolution12" aria-labelledby="headingSolution12">
 <div class="accordion-body">
 <p>What do you think will be the result of
 <code>length(matrix_example)</code>?</p>
@@ -2171,7 +2171,7 @@ <h4 class="accordion-header" id="headingSolution13">
   Solution to Challenge 7
   </h4>
 </button>
-<div id="collapseSolution13" class="accordion-collapse collapse" aria-labelledby="headingSolution13" data-bs-parent="#accordionSolution13">
+<div id="collapseSolution13" class="accordion-collapse collapse" data-bs-parent="#accordionSolution13" aria-labelledby="headingSolution13">
 <div class="accordion-body">
 <p>Make another matrix, this time containing the numbers 1:50, with 5
 columns and 10 rows. Did the <code>matrix</code> function fill your
@@ -2213,7 +2213,7 @@ <h4 class="accordion-header" id="headingSolution14">
   Solution to Challenge 8
   </h4>
 </button>
-<div id="collapseSolution14" class="accordion-collapse collapse" aria-labelledby="headingSolution14" data-bs-parent="#accordionSolution14">
+<div id="collapseSolution14" class="accordion-collapse collapse" data-bs-parent="#accordionSolution14" aria-labelledby="headingSolution14">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb173">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -2265,7 +2265,7 @@ <h4 class="accordion-header" id="headingSolution15">
   Solution to Challenge 9
   </h4>
 </button>
-<div id="collapseSolution15" class="accordion-collapse collapse" aria-labelledby="headingSolution15" data-bs-parent="#accordionSolution15">
+<div id="collapseSolution15" class="accordion-collapse collapse" data-bs-parent="#accordionSolution15" aria-labelledby="headingSolution15">
 <div class="accordion-body">
 <p>Consider the R output of the matrix below:</p>
 <div class="codewrapper">
@@ -2366,7 +2366,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
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   "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/instructor/05-data-structures-part2.html b/instructor/05-data-structures-part2.html
index 85a96c115..36ad8ed58 100644
--- a/instructor/05-data-structures-part2.html
+++ b/instructor/05-data-structures-part2.html
@@ -684,7 +684,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Solution to Challenge 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb30">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -969,7 +969,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Solution to Challenge 2
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <p>To check the last few lines it’s relatively simple as R already has a
 function for this:</p>
@@ -1030,7 +1030,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Solution to Challenge 3
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>The <code>source</code> function can be used to use a script within a
 script. Assume you would like to load the same type of file over and
@@ -1083,7 +1083,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Solution to Challenge 4
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <p>The object <code>gapminder</code> is a data frame with columns</p>
 <ul><li>
@@ -1179,7 +1179,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
   "identifier": "https://UCL.github.io/ClinicianCoders/instructor/05-data-structures-part2.html",
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   "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
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   </script><script>
diff --git a/instructor/06-data-subsetting.html b/instructor/06-data-subsetting.html
index 48aabde01..3af4987bd 100644
--- a/instructor/06-data-subsetting.html
+++ b/instructor/06-data-subsetting.html
@@ -697,7 +697,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Solution to challenge 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb34">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -886,7 +886,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Solution to challenge 2
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb50">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1141,7 +1141,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Solution to challenge 3
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <ul><li>The <strong>wrong</strong> way to do this problem is
 <code>countries==seAsia</code>. This gives a warning
@@ -1424,7 +1424,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Solution to challenge 4
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <p>D</p>
 </div>
@@ -1571,7 +1571,7 @@ <h4 class="accordion-header" id="headingSolution5">
   Solution to challenge 5
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb115">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1637,7 +1637,7 @@ <h4 class="accordion-header" id="headingSolution6">
   Solution to challenge 6
   </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb122">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -1793,7 +1793,7 @@ <h4 class="accordion-header" id="headingSolution7">
   Solution to challenge 7
   </h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
+<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
 <div class="accordion-body">
 <p>Fix each of the following common data frame subsetting errors:</p>
 <ol style="list-style-type: decimal"><li>Extract observations collected for the year 1957</li>
@@ -1867,7 +1867,7 @@ <h4 class="accordion-header" id="headingSolution8">
   Solution to challenge 8
   </h4>
 </button>
-<div id="collapseSolution8" class="accordion-collapse collapse" data-bs-parent="#accordionSolution8" aria-labelledby="headingSolution8">
+<div id="collapseSolution8" class="accordion-collapse collapse" aria-labelledby="headingSolution8" data-bs-parent="#accordionSolution8">
 <div class="accordion-body">
 <ol style="list-style-type: decimal"><li><p><code>gapminder</code> is a data.frame so needs to be subsetted
 on two dimensions. <code>gapminder[1:20, ]</code> subsets the data to
@@ -1961,7 +1961,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
   "identifier": "https://UCL.github.io/ClinicianCoders/instructor/06-data-subsetting.html",
   "dateCreated": "2023-10-26",
   "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/instructor/07-control-flow.html b/instructor/07-control-flow.html
index cafb66270..97e342e17 100644
--- a/instructor/07-control-flow.html
+++ b/instructor/07-control-flow.html
@@ -1217,7 +1217,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
   "identifier": "https://UCL.github.io/ClinicianCoders/instructor/07-control-flow.html",
   "dateCreated": "2023-10-26",
   "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/instructor/08-plot-ggplot2.html b/instructor/08-plot-ggplot2.html
index c642c8f18..187cf1dd5 100644
--- a/instructor/08-plot-ggplot2.html
+++ b/instructor/08-plot-ggplot2.html
@@ -497,7 +497,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Solution to challenge 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <p>Here is one possible solution:</p>
 <div class="codewrapper sourceCode" id="cb5">
@@ -538,7 +538,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Solution to challenge 2
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <p>The solution presented below adds <code>color=continent</code> to the
 call of the <code>aes</code> function. The general trend seems to
@@ -650,7 +650,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Solution to challenge 3
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>The lines now get drawn over the points!</p>
 <div class="codewrapper sourceCode" id="cb11">
@@ -782,7 +782,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Solution to challenge 4a
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <p>Here a possible solution: Notice that the <code>color</code> argument
 is supplied outside of the <code>aes()</code> function. This means that
@@ -826,7 +826,7 @@ <h4 class="accordion-header" id="headingSolution5">
   Solution to challenge 4b
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
 <div class="accordion-body">
 <p>Here is a possible solution: Notice that supplying the
 <code>color</code> argument inside the <code>aes()</code> functions
@@ -980,7 +980,7 @@ <h4 class="accordion-header" id="headingSolution6">
   Solution to Challenge 5
   </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
 <div class="accordion-body">
 <p>Here a possible solution: <code>xlab()</code> and <code>ylab()</code>
 set labels for the x and y axes, respectively The axis title, text and
@@ -1075,7 +1075,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
   "identifier": "https://UCL.github.io/ClinicianCoders/instructor/08-plot-ggplot2.html",
   "dateCreated": "2023-10-26",
   "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/instructor/09-vectorization.html b/instructor/09-vectorization.html
index 257a08d82..fee99a8d8 100644
--- a/instructor/09-vectorization.html
+++ b/instructor/09-vectorization.html
@@ -469,7 +469,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Solution to challenge 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <p>Let’s try this on the <code>pop</code> column of the
 <code>gapminder</code> dataset.</p>
@@ -521,7 +521,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Solution to challenge 2
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <p>Refresh your plotting skills by plotting population in millions
 against year.</p>
@@ -700,7 +700,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Solution to challenge 3
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>Given the following matrix:</p>
 <div class="codewrapper sourceCode" id="cb28">
@@ -779,7 +779,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Challenge 4
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <p>We’re interested in looking at the sum of the following sequence of
 fractions:</p>
@@ -990,7 +990,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
   "identifier": "https://UCL.github.io/ClinicianCoders/instructor/09-vectorization.html",
   "dateCreated": "2023-10-26",
   "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/instructor/10-functions.html b/instructor/10-functions.html
index 08581af05..76055700d 100644
--- a/instructor/10-functions.html
+++ b/instructor/10-functions.html
@@ -1191,7 +1191,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
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   "dateCreated": "2023-10-26",
   "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/instructor/11-writing-data.html b/instructor/11-writing-data.html
index 35cd6dbfe..ba73a208a 100644
--- a/instructor/11-writing-data.html
+++ b/instructor/11-writing-data.html
@@ -442,7 +442,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Solution to challenge 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
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 <div class="codewrapper sourceCode" id="cb3">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -568,7 +568,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Solution to challenge 2
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb11">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -657,7 +657,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
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   "dateCreated": "2023-10-26",
   "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/instructor/12-plyr.html b/instructor/12-plyr.html
index 4f20b30b4..55bd2fcb5 100644
--- a/instructor/12-plyr.html
+++ b/instructor/12-plyr.html
@@ -981,7 +981,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
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   "dateCreated": "2023-10-26",
   "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/instructor/13-dplyr.html b/instructor/13-dplyr.html
index 0dcebc6d3..18ad93979 100644
--- a/instructor/13-dplyr.html
+++ b/instructor/13-dplyr.html
@@ -1209,7 +1209,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
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   "dateCreated": "2023-10-26",
   "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/instructor/14-tidyr.html b/instructor/14-tidyr.html
index cb2baa4de..53ecc6809 100644
--- a/instructor/14-tidyr.html
+++ b/instructor/14-tidyr.html
@@ -1130,7 +1130,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
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   "dateCreated": "2023-10-26",
   "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "datePublished": "2023-11-22"
 }
 
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diff --git a/instructor/15-knitr-markdown.html b/instructor/15-knitr-markdown.html
index 92275e7f0..cda2e0f2a 100644
--- a/instructor/15-knitr-markdown.html
+++ b/instructor/15-knitr-markdown.html
@@ -909,7 +909,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
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   "dateCreated": "2023-10-26",
   "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/instructor/16-wrap-up.html b/instructor/16-wrap-up.html
index a1f151922..22d484184 100644
--- a/instructor/16-wrap-up.html
+++ b/instructor/16-wrap-up.html
@@ -557,7 +557,7 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
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   "dateCreated": "2023-10-26",
   "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/instructor/404.html b/instructor/404.html
index 3ac399636..011a31f30 100644
--- a/instructor/404.html
+++ b/instructor/404.html
@@ -419,8 +419,8 @@ <h1>Page not found</h1>
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   "identifier": "https://UCL.github.io/ClinicianCoders/instructor/404.html",
   "dateCreated": "2023-10-26",
-  "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "dateModified": "2023-11-22",
+  "datePublished": "2023-11-22"
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   </script><script>
diff --git a/instructor/CODE_OF_CONDUCT.html b/instructor/CODE_OF_CONDUCT.html
index 62f07b0c7..94802d5da 100644
--- a/instructor/CODE_OF_CONDUCT.html
+++ b/instructor/CODE_OF_CONDUCT.html
@@ -420,7 +420,7 @@ <h1>Contributor Code of Conduct</h1>
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   "dateCreated": "2023-10-26",
   "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/instructor/LICENSE.html b/instructor/LICENSE.html
index 542066101..4fb9b6bc0 100644
--- a/instructor/LICENSE.html
+++ b/instructor/LICENSE.html
@@ -471,7 +471,7 @@ <h1>Licenses</h1>
   "identifier": "https://UCL.github.io/ClinicianCoders/instructor/LICENSE.html",
   "dateCreated": "2023-10-26",
   "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/instructor/aio.html b/instructor/aio.html
index 91982b4ad..e96660800 100644
--- a/instructor/aio.html
+++ b/instructor/aio.html
@@ -2128,7 +2128,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Solution to Challenge 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>The <code>c()</code> function creates a vector, in which all elements
 are of the same type. In the first case, the elements are numeric, in
@@ -2159,7 +2159,7 @@ <h4 class="accordion-header" id="headingSolution2">
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 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <p>To look at the help for the <code>paste()</code> function, use:</p>
 <div class="codewrapper sourceCode" id="cb11">
@@ -2269,7 +2269,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Solution to Challenge 3
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <p>The standard R function for reading tab-delimited files with a period
 decimal separator is read.delim(). You can also do this with
@@ -2777,7 +2777,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Discussion 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
 <div class="accordion-body">
 <p>By keeping everything in a column the same, we allow ourselves to
 make simple assumptions about our data; if you can interpret one entry
@@ -3009,7 +3009,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Tip 1.1
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
 <div class="accordion-body">
 <p>Show the content of any variable by typing its name.</p>
 <div class="section level3">
@@ -3044,7 +3044,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Tip 1.2
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
 <div class="accordion-body">
 <p>In the chapter “Data types” we saw two functions that can show data
 types. One printed just a single word, the data type name. The other
@@ -3088,7 +3088,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Tip 1.3
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
 <div class="accordion-body">
 <p>Scroll up to the section about the <a href="#the-type-hierarchy">type
 hierarchy</a> to review the available data types</p>
@@ -3103,7 +3103,7 @@ <h4 class="accordion-header" id="headingSolution5">
   Solution to Challenge 1.3
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
 <div class="accordion-body">
 <ul>
 <li>Weight is expressed on a continuous scale (real numbers). The R data
@@ -3139,7 +3139,7 @@ <h4 class="accordion-header" id="headingSolution6">
   Tip 1.4
   </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
 <div class="accordion-body">
 <p>Revisit the hierarchy of data types when two different data types are
 combined.</p>
@@ -3180,7 +3180,7 @@ <h4 class="accordion-header" id="headingSolution7">
   Tip 1.5
   </h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
+<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
 <div class="accordion-body">
 <p>The functions to convert data types start with <code>as.</code>. You
 can look for the function further up in the manuscript or use the
@@ -3373,7 +3373,7 @@ <h4 class="accordion-header" id="headingSolution8">
   Solution to Challenge 2
   </h4>
 </button>
-<div id="collapseSolution8" class="accordion-collapse collapse" aria-labelledby="headingSolution8" data-bs-parent="#accordionSolution8">
+<div id="collapseSolution8" class="accordion-collapse collapse" data-bs-parent="#accordionSolution8" aria-labelledby="headingSolution8">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb92">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -3605,7 +3605,7 @@ <h4 class="accordion-header" id="headingSolution9">
   Solution to Challenge 3
   </h4>
 </button>
-<div id="collapseSolution9" class="accordion-collapse collapse" aria-labelledby="headingSolution9" data-bs-parent="#accordionSolution9">
+<div id="collapseSolution9" class="accordion-collapse collapse" data-bs-parent="#accordionSolution9" aria-labelledby="headingSolution9">
 <div class="accordion-body">
 <p>You get the names of an object by wrapping the object name inside
 <code>names(...)</code>. Similarly, you get the data type of the names
@@ -3652,7 +3652,7 @@ <h4 class="accordion-header" id="headingSolution10">
   Solution to Challenge 4
   </h4>
 </button>
-<div id="collapseSolution10" class="accordion-collapse collapse" aria-labelledby="headingSolution10" data-bs-parent="#accordionSolution10">
+<div id="collapseSolution10" class="accordion-collapse collapse" data-bs-parent="#accordionSolution10" aria-labelledby="headingSolution10">
 <div class="accordion-body">
 <pre><code><span><span class="va">letter_no</span> <span class="op">&lt;-</span> <span class="fl">1</span><span class="op">:</span><span class="fl">26</span>   <span class="co"># or seq(1,26)</span></span>
 <span><span class="fu">names</span><span class="op">(</span><span class="va">letter_no</span><span class="op">)</span> <span class="op">&lt;-</span> <span class="va">LETTERS</span></span>
@@ -3845,7 +3845,7 @@ <h4 class="accordion-header" id="headingSolution11">
   Solution to Challenge 5
   </h4>
 </button>
-<div id="collapseSolution11" class="accordion-collapse collapse" aria-labelledby="headingSolution11" data-bs-parent="#accordionSolution11">
+<div id="collapseSolution11" class="accordion-collapse collapse" data-bs-parent="#accordionSolution11" aria-labelledby="headingSolution11">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb138">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -4108,7 +4108,7 @@ <h4 class="accordion-header" id="headingSolution12">
   Solution to Challenge 6
   </h4>
 </button>
-<div id="collapseSolution12" class="accordion-collapse collapse" aria-labelledby="headingSolution12" data-bs-parent="#accordionSolution12">
+<div id="collapseSolution12" class="accordion-collapse collapse" data-bs-parent="#accordionSolution12" aria-labelledby="headingSolution12">
 <div class="accordion-body">
 <p>What do you think will be the result of
 <code>length(matrix_example)</code>?</p>
@@ -4154,7 +4154,7 @@ <h4 class="accordion-header" id="headingSolution13">
   Solution to Challenge 7
   </h4>
 </button>
-<div id="collapseSolution13" class="accordion-collapse collapse" aria-labelledby="headingSolution13" data-bs-parent="#accordionSolution13">
+<div id="collapseSolution13" class="accordion-collapse collapse" data-bs-parent="#accordionSolution13" aria-labelledby="headingSolution13">
 <div class="accordion-body">
 <p>Make another matrix, this time containing the numbers 1:50, with 5
 columns and 10 rows. Did the <code>matrix</code> function fill your
@@ -4198,7 +4198,7 @@ <h4 class="accordion-header" id="headingSolution14">
   Solution to Challenge 8
   </h4>
 </button>
-<div id="collapseSolution14" class="accordion-collapse collapse" aria-labelledby="headingSolution14" data-bs-parent="#accordionSolution14">
+<div id="collapseSolution14" class="accordion-collapse collapse" data-bs-parent="#accordionSolution14" aria-labelledby="headingSolution14">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb173">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -4252,7 +4252,7 @@ <h4 class="accordion-header" id="headingSolution15">
   Solution to Challenge 9
   </h4>
 </button>
-<div id="collapseSolution15" class="accordion-collapse collapse" aria-labelledby="headingSolution15" data-bs-parent="#accordionSolution15">
+<div id="collapseSolution15" class="accordion-collapse collapse" data-bs-parent="#accordionSolution15" aria-labelledby="headingSolution15">
 <div class="accordion-body">
 <p>Consider the R output of the matrix below:</p>
 <div class="codewrapper">
@@ -4632,7 +4632,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Solution to Challenge 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb30">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -4924,7 +4924,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Solution to Challenge 2
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <p>To check the last few lines it’s relatively simple as R already has a
 function for this:</p>
@@ -4986,7 +4986,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Solution to Challenge 3
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>The <code>source</code> function can be used to use a script within a
 script. Assume you would like to load the same type of file over and
@@ -5039,7 +5039,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Solution to Challenge 4
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <p>The object <code>gapminder</code> is a data frame with columns</p>
 <ul>
@@ -5420,7 +5420,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Solution to challenge 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb34">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -5615,7 +5615,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Solution to challenge 2
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb50">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -5872,7 +5872,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Solution to challenge 3
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <ul>
 <li>The <strong>wrong</strong> way to do this problem is
@@ -6165,7 +6165,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Solution to challenge 4
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <p>D</p>
 </div>
@@ -6313,7 +6313,7 @@ <h4 class="accordion-header" id="headingSolution5">
   Solution to challenge 5
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb115">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -6379,7 +6379,7 @@ <h4 class="accordion-header" id="headingSolution6">
   Solution to challenge 6
   </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb122">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -6546,7 +6546,7 @@ <h4 class="accordion-header" id="headingSolution7">
   Solution to challenge 7
   </h4>
 </button>
-<div id="collapseSolution7" class="accordion-collapse collapse" data-bs-parent="#accordionSolution7" aria-labelledby="headingSolution7">
+<div id="collapseSolution7" class="accordion-collapse collapse" aria-labelledby="headingSolution7" data-bs-parent="#accordionSolution7">
 <div class="accordion-body">
 <p>Fix each of the following common data frame subsetting errors:</p>
 <ol style="list-style-type: decimal">
@@ -6632,7 +6632,7 @@ <h4 class="accordion-header" id="headingSolution8">
   Solution to challenge 8
   </h4>
 </button>
-<div id="collapseSolution8" class="accordion-collapse collapse" data-bs-parent="#accordionSolution8" aria-labelledby="headingSolution8">
+<div id="collapseSolution8" class="accordion-collapse collapse" aria-labelledby="headingSolution8" data-bs-parent="#accordionSolution8">
 <div class="accordion-body">
 <ol style="list-style-type: decimal">
 <li><p><code>gapminder</code> is a data.frame so needs to be subsetted
@@ -7629,7 +7629,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Solution to challenge 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <p>Here is one possible solution:</p>
 <div class="codewrapper sourceCode" id="cb5">
@@ -7671,7 +7671,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Solution to challenge 2
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <p>The solution presented below adds <code>color=continent</code> to the
 call of the <code>aes</code> function. The general trend seems to
@@ -7785,7 +7785,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Solution to challenge 3
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>The lines now get drawn over the points!</p>
 <div class="codewrapper sourceCode" id="cb11">
@@ -7919,7 +7919,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Solution to challenge 4a
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <p>Here a possible solution: Notice that the <code>color</code> argument
 is supplied outside of the <code>aes()</code> function. This means that
@@ -7964,7 +7964,7 @@ <h4 class="accordion-header" id="headingSolution5">
   Solution to challenge 4b
   </h4>
 </button>
-<div id="collapseSolution5" class="accordion-collapse collapse" data-bs-parent="#accordionSolution5" aria-labelledby="headingSolution5">
+<div id="collapseSolution5" class="accordion-collapse collapse" aria-labelledby="headingSolution5" data-bs-parent="#accordionSolution5">
 <div class="accordion-body">
 <p>Here is a possible solution: Notice that supplying the
 <code>color</code> argument inside the <code>aes()</code> functions
@@ -8124,7 +8124,7 @@ <h4 class="accordion-header" id="headingSolution6">
   Solution to Challenge 5
   </h4>
 </button>
-<div id="collapseSolution6" class="accordion-collapse collapse" data-bs-parent="#accordionSolution6" aria-labelledby="headingSolution6">
+<div id="collapseSolution6" class="accordion-collapse collapse" aria-labelledby="headingSolution6" data-bs-parent="#accordionSolution6">
 <div class="accordion-body">
 <p>Here a possible solution: <code>xlab()</code> and <code>ylab()</code>
 set labels for the x and y axes, respectively The axis title, text and
@@ -8289,7 +8289,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Solution to challenge 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <p>Let’s try this on the <code>pop</code> column of the
 <code>gapminder</code> dataset.</p>
@@ -8341,7 +8341,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Solution to challenge 2
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <p>Refresh your plotting skills by plotting population in millions
 against year.</p>
@@ -8523,7 +8523,7 @@ <h4 class="accordion-header" id="headingSolution3">
   Solution to challenge 3
   </h4>
 </button>
-<div id="collapseSolution3" class="accordion-collapse collapse" data-bs-parent="#accordionSolution3" aria-labelledby="headingSolution3">
+<div id="collapseSolution3" class="accordion-collapse collapse" aria-labelledby="headingSolution3" data-bs-parent="#accordionSolution3">
 <div class="accordion-body">
 <p>Given the following matrix:</p>
 <div class="codewrapper sourceCode" id="cb28">
@@ -8608,7 +8608,7 @@ <h4 class="accordion-header" id="headingSolution4">
   Challenge 4
   </h4>
 </button>
-<div id="collapseSolution4" class="accordion-collapse collapse" data-bs-parent="#accordionSolution4" aria-labelledby="headingSolution4">
+<div id="collapseSolution4" class="accordion-collapse collapse" aria-labelledby="headingSolution4" data-bs-parent="#accordionSolution4">
 <div class="accordion-body">
 <p>We’re interested in looking at the sum of the following sequence of
 fractions:</p>
@@ -9642,7 +9642,7 @@ <h4 class="accordion-header" id="headingSolution1">
   Solution to challenge 1
   </h4>
 </button>
-<div id="collapseSolution1" class="accordion-collapse collapse" data-bs-parent="#accordionSolution1" aria-labelledby="headingSolution1">
+<div id="collapseSolution1" class="accordion-collapse collapse" aria-labelledby="headingSolution1" data-bs-parent="#accordionSolution1">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb3">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -9769,7 +9769,7 @@ <h4 class="accordion-header" id="headingSolution2">
   Solution to challenge 2
   </h4>
 </button>
-<div id="collapseSolution2" class="accordion-collapse collapse" data-bs-parent="#accordionSolution2" aria-labelledby="headingSolution2">
+<div id="collapseSolution2" class="accordion-collapse collapse" aria-labelledby="headingSolution2" data-bs-parent="#accordionSolution2">
 <div class="accordion-body">
 <div class="codewrapper sourceCode" id="cb11">
 <h3 class="code-label">R<i aria-hidden="true" data-feather="chevron-left"></i><i aria-hidden="true" data-feather="chevron-right"></i>
@@ -12635,8 +12635,8 @@ <h3 class="callout-title">Keypoints<a class="anchor" aria-label="anchor" href="#
   "url": "https://UCL.github.io/ClinicianCoders/instructor/aio.html",
   "identifier": "https://UCL.github.io/ClinicianCoders/instructor/aio.html",
   "dateCreated": "2023-10-26",
-  "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "dateModified": "2023-11-22",
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/instructor/discuss.html b/instructor/discuss.html
index 9033f41ee..8772ca4ec 100644
--- a/instructor/discuss.html
+++ b/instructor/discuss.html
@@ -414,7 +414,7 @@ <h1>Discussion</h1>
   "identifier": "https://UCL.github.io/ClinicianCoders/instructor/discuss.html",
   "dateCreated": "2023-10-26",
   "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/instructor/images.html b/instructor/images.html
index 9af404260..c39a4c46b 100644
--- a/instructor/images.html
+++ b/instructor/images.html
@@ -609,8 +609,8 @@ <h3 id="15-knitr-markdown-figure-3">Figure 3</h3>
   "url": "https://UCL.github.io/ClinicianCoders/instructor/images.html",
   "identifier": "https://UCL.github.io/ClinicianCoders/instructor/images.html",
   "dateCreated": "2023-10-26",
-  "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "dateModified": "2023-11-22",
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/instructor/index.html b/instructor/index.html
index df96fd6df..fedd54a1d 100644
--- a/instructor/index.html
+++ b/instructor/index.html
@@ -592,8 +592,8 @@ <h3 class="callout-title">Prerequisites<a class="anchor" aria-label="anchor" hre
   "url": "https://UCL.github.io/ClinicianCoders/instructor/index.html",
   "identifier": "https://UCL.github.io/ClinicianCoders/instructor/index.html",
   "dateCreated": "2023-10-26",
-  "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "dateModified": "2023-11-22",
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/instructor/instructor-notes.html b/instructor/instructor-notes.html
index 9c23c938c..8dd50ee62 100644
--- a/instructor/instructor-notes.html
+++ b/instructor/instructor-notes.html
@@ -607,8 +607,8 @@ <h3 class="code-label">BASH<i aria-hidden="true" data-feather="chevron-left"></i
   "url": "https://UCL.github.io/ClinicianCoders/instructor/instructor-notes.html",
   "identifier": "https://UCL.github.io/ClinicianCoders/instructor/instructor-notes.html",
   "dateCreated": "2023-10-26",
-  "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "dateModified": "2023-11-22",
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/instructor/key-points.html b/instructor/key-points.html
index 4b6358f96..40e70bd26 100644
--- a/instructor/key-points.html
+++ b/instructor/key-points.html
@@ -585,8 +585,8 @@ <h2 class="accordion-header" id="flush-headingTwelve">
   "url": "https://UCL.github.io/ClinicianCoders/instructor/key-points.html",
   "identifier": "https://UCL.github.io/ClinicianCoders/instructor/key-points.html",
   "dateCreated": "2023-10-26",
-  "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "dateModified": "2023-11-22",
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/instructor/profiles.html b/instructor/profiles.html
index f9aa902d6..0ff7e0f76 100644
--- a/instructor/profiles.html
+++ b/instructor/profiles.html
@@ -369,8 +369,8 @@ <h1>Learner Profiles</h1>
   "url": "https://UCL.github.io/ClinicianCoders/instructor/profiles.html",
   "identifier": "https://UCL.github.io/ClinicianCoders/instructor/profiles.html",
   "dateCreated": "2023-10-26",
-  "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "dateModified": "2023-11-22",
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/instructor/reference.html b/instructor/reference.html
index 7bc48e7d0..de984c4da 100644
--- a/instructor/reference.html
+++ b/instructor/reference.html
@@ -932,7 +932,7 @@ <h1>Reference</h1>
   "identifier": "https://UCL.github.io/ClinicianCoders/instructor/reference.html",
   "dateCreated": "2023-10-26",
   "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/key-points.html b/key-points.html
index fcfca8b40..25e23af26 100644
--- a/key-points.html
+++ b/key-points.html
@@ -589,8 +589,8 @@ <h2 class="accordion-header" id="flush-headingTwelve">
   "url": "https://UCL.github.io/ClinicianCoders/key-points.html",
   "identifier": "https://UCL.github.io/ClinicianCoders/key-points.html",
   "dateCreated": "2023-10-26",
-  "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "dateModified": "2023-11-22",
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/pkgdown.yml b/pkgdown.yml
index 460ecba52..0caebf4b3 100644
--- a/pkgdown.yml
+++ b/pkgdown.yml
@@ -2,5 +2,5 @@ pandoc: 2.19.2
 pkgdown: 2.0.7
 pkgdown_sha: ~
 articles: {}
-last_built: 2023-11-21T00:30Z
+last_built: 2023-11-22T13:55Z
 
diff --git a/profiles.html b/profiles.html
index 052c0d484..1bc58485e 100644
--- a/profiles.html
+++ b/profiles.html
@@ -370,8 +370,8 @@ <h1>Learner Profiles</h1>
   "url": "https://UCL.github.io/ClinicianCoders/profiles.html",
   "identifier": "https://UCL.github.io/ClinicianCoders/profiles.html",
   "dateCreated": "2023-10-26",
-  "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "dateModified": "2023-11-22",
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/reference.html b/reference.html
index 8be5d6f2f..6c1e5835d 100644
--- a/reference.html
+++ b/reference.html
@@ -931,7 +931,7 @@ <h1>Reference</h1>
   "identifier": "https://UCL.github.io/ClinicianCoders/reference.html",
   "dateCreated": "2023-10-26",
   "dateModified": "2023-11-21",
-  "datePublished": "2023-11-21"
+  "datePublished": "2023-11-22"
 }
 
   </script><script>
diff --git a/renv.lock b/renv.lock
index b5e8065a8..0cd4ce3bb 100644
--- a/renv.lock
+++ b/renv.lock
@@ -1,6 +1,6 @@
 {
   "R": {
-    "Version": "4.3.1",
+    "Version": "4.3.2",
     "Repositories": [
       {
         "Name": "carpentries",