diff --git a/01-intro.Rmd b/01-intro.Rmd
index 6b16e73..83fd08a 100644
--- a/01-intro.Rmd
+++ b/01-intro.Rmd
@@ -2,6 +2,9 @@
 
 You can label chapter and section titles using `{#label}` after them, e.g., we can reference Chapter \@ref(intro). If you do not manually label them, there will be automatic labels anyway, e.g., Chapter \@ref(methods).
 
+PRUEBA PARA ENVIO PULL REQUEST 
+
+
 Figures and tables with captions will be placed in `figure` and `table` environments, respectively.
 
 ```{r nice-fig, fig.cap='Here is a nice figure!', out.width='80%', fig.asp=.75, fig.align='center'}
diff --git a/_book/intro.html b/_book/intro.html
index 1192c8e..49380b0 100644
--- a/_book/intro.html
+++ b/_book/intro.html
@@ -6,7 +6,7 @@
   <meta http-equiv="X-UA-Compatible" content="IE=edge" />
   <title>Chapter 2 Introduction | A Minimal Book Example</title>
   <meta name="description" content="This is a minimal example of using the bookdown package to write a book. The output format for this example is bookdown::gitbook." />
-  <meta name="generator" content="bookdown 0.18 and GitBook 2.6.7" />
+  <meta name="generator" content="bookdown 0.20 and GitBook 2.6.7" />
 
   <meta property="og:title" content="Chapter 2 Introduction | A Minimal Book Example" />
   <meta property="og:type" content="book" />
@@ -50,6 +50,7 @@
 
 
 
+<script src="libs/accessible-code-block-0.0.1/empty-anchor.js"></script>
 
 
 <style type="text/css">
@@ -166,9 +167,11 @@ <h1>
 <div id="intro" class="section level1">
 <h1><span class="header-section-number">Chapter 2</span> Introduction</h1>
 <p>You can label chapter and section titles using <code>{#label}</code> after them, e.g., we can reference Chapter <a href="intro.html#intro">2</a>. If you do not manually label them, there will be automatic labels anyway, e.g., Chapter <a href="methods.html#methods">4</a>.</p>
+<p>Hola chicas Rladies super power
+Aquí dejo muestra del algún commit colaborativo</p>
 <p>Figures and tables with captions will be placed in <code>figure</code> and <code>table</code> environments, respectively.</p>
-<div class="sourceCode" id="cb2"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb2-1"><a href="intro.html#cb2-1"></a><span class="kw">par</span>(<span class="dt">mar =</span> <span class="kw">c</span>(<span class="dv">4</span>, <span class="dv">4</span>, <span class="fl">.1</span>, <span class="fl">.1</span>))</span>
-<span id="cb2-2"><a href="intro.html#cb2-2"></a><span class="kw">plot</span>(pressure, <span class="dt">type =</span> <span class="st">&#39;b&#39;</span>, <span class="dt">pch =</span> <span class="dv">19</span>)</span></code></pre></div>
+<div class="sourceCode" id="cb1"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb1-1"><a href="intro.html#cb1-1"></a><span class="kw">par</span>(<span class="dt">mar =</span> <span class="kw">c</span>(<span class="dv">4</span>, <span class="dv">4</span>, <span class="fl">.1</span>, <span class="fl">.1</span>))</span>
+<span id="cb1-2"><a href="intro.html#cb1-2"></a><span class="kw">plot</span>(pressure, <span class="dt">type =</span> <span class="st">&#39;b&#39;</span>, <span class="dt">pch =</span> <span class="dv">19</span>)</span></code></pre></div>
 <div class="figure" style="text-align: center"><span id="fig:nice-fig"></span>
 <img src="book_git_prueba_files/figure-html/nice-fig-1.png" alt="Here is a nice figure!" width="80%" />
 <p class="caption">
@@ -176,10 +179,10 @@ <h1><span class="header-section-number">Chapter 2</span> Introduction</h1>
 </p>
 </div>
 <p>Reference a figure by its code chunk label with the <code>fig:</code> prefix, e.g., see Figure <a href="intro.html#fig:nice-fig">2.1</a>. Similarly, you can reference tables generated from <code>knitr::kable()</code>, e.g., see Table <a href="intro.html#tab:nice-tab">2.1</a>.</p>
-<div class="sourceCode" id="cb3"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb3-1"><a href="intro.html#cb3-1"></a>knitr<span class="op">::</span><span class="kw">kable</span>(</span>
-<span id="cb3-2"><a href="intro.html#cb3-2"></a>  <span class="kw">head</span>(iris, <span class="dv">20</span>), <span class="dt">caption =</span> <span class="st">&#39;Here is a nice table!&#39;</span>,</span>
-<span id="cb3-3"><a href="intro.html#cb3-3"></a>  <span class="dt">booktabs =</span> <span class="ot">TRUE</span></span>
-<span id="cb3-4"><a href="intro.html#cb3-4"></a>)</span></code></pre></div>
+<div class="sourceCode" id="cb2"><pre class="sourceCode r"><code class="sourceCode r"><span id="cb2-1"><a href="intro.html#cb2-1"></a>knitr<span class="op">::</span><span class="kw">kable</span>(</span>
+<span id="cb2-2"><a href="intro.html#cb2-2"></a>  <span class="kw">head</span>(iris, <span class="dv">20</span>), <span class="dt">caption =</span> <span class="st">&#39;Here is a nice table!&#39;</span>,</span>
+<span id="cb2-3"><a href="intro.html#cb2-3"></a>  <span class="dt">booktabs =</span> <span class="ot">TRUE</span></span>
+<span id="cb2-4"><a href="intro.html#cb2-4"></a>)</span></code></pre></div>
 <table>
 <caption><span id="tab:nice-tab">Table 2.1: </span>Here is a nice table!</caption>
 <thead>
@@ -402,20 +405,6 @@ <h3>References</h3>
 });
 </script>
 
-<!-- dynamically load mathjax for compatibility with self-contained -->
-<script>
-  (function () {
-    var script = document.createElement("script");
-    script.type = "text/javascript";
-    var src = "true";
-    if (src === "" || src === "true") src = "https://mathjax.rstudio.com/latest/MathJax.js?config=TeX-MML-AM_CHTML";
-    if (location.protocol !== "file:")
-      if (/^https?:/.test(src))
-        src = src.replace(/^https?:/, '');
-    script.src = src;
-    document.getElementsByTagName("head")[0].appendChild(script);
-  })();
-</script>
 </body>
 
 </html>
diff --git a/_book/libs/accessible-code-block-0.0.1/empty-anchor.js b/_book/libs/accessible-code-block-0.0.1/empty-anchor.js
new file mode 100644
index 0000000..ca349fd
--- /dev/null
+++ b/_book/libs/accessible-code-block-0.0.1/empty-anchor.js
@@ -0,0 +1,15 @@
+// Hide empty <a> tag within highlighted CodeBlock for screen reader accessibility (see https://github.com/jgm/pandoc/issues/6352#issuecomment-626106786) -->
+// v0.0.1
+// Written by JooYoung Seo (jooyoung@psu.edu) and Atsushi Yasumoto on June 1st, 2020.
+
+document.addEventListener('DOMContentLoaded', function() {
+  const codeList = document.getElementsByClassName("sourceCode");
+  for (var i = 0; i < codeList.length; i++) {
+    var linkList = codeList[i].getElementsByTagName('a');
+    for (var j = 0; j < linkList.length; j++) {
+      if (linkList[j].innerHTML === "") {
+        linkList[j].setAttribute('aria-hidden', 'true');
+      }
+    }
+  }
+});
diff --git a/_book/search_index.json b/_book/search_index.json
index cf2bc78..5181e2a 100644
--- a/_book/search_index.json
+++ b/_book/search_index.json
@@ -1,3 +1,15 @@
 [
+<<<<<<< HEAD
+["intro.html", "Chapter 2 Introduction", " Chapter 2 Introduction You can label chapter and section titles using {#label} after them, e.g., we can reference Chapter 2. If you do not manually label them, there will be automatic labels anyway, e.g., Chapter 4. Hola chicas Rladies super power Aquí dejo muestra del algún commit colaborativo Figures and tables with captions will be placed in figure and table environments, respectively. par(mar = c(4, 4, .1, .1)) plot(pressure, type = &#39;b&#39;, pch = 19) Figure 2.1: Here is a nice figure! Reference a figure by its code chunk label with the fig: prefix, e.g., see Figure 2.1. Similarly, you can reference tables generated from knitr::kable(), e.g., see Table 2.1. knitr::kable( head(iris, 20), caption = &#39;Here is a nice table!&#39;, booktabs = TRUE ) Table 2.1: Here is a nice table! Sepal.Length Sepal.Width Petal.Length Petal.Width Species 5.1 3.5 1.4 0.2 setosa 4.9 3.0 1.4 0.2 setosa 4.7 3.2 1.3 0.2 setosa 4.6 3.1 1.5 0.2 setosa 5.0 3.6 1.4 0.2 setosa 5.4 3.9 1.7 0.4 setosa 4.6 3.4 1.4 0.3 setosa 5.0 3.4 1.5 0.2 setosa 4.4 2.9 1.4 0.2 setosa 4.9 3.1 1.5 0.1 setosa 5.4 3.7 1.5 0.2 setosa 4.8 3.4 1.6 0.2 setosa 4.8 3.0 1.4 0.1 setosa 4.3 3.0 1.1 0.1 setosa 5.8 4.0 1.2 0.2 setosa 5.7 4.4 1.5 0.4 setosa 5.4 3.9 1.3 0.4 setosa 5.1 3.5 1.4 0.3 setosa 5.7 3.8 1.7 0.3 setosa 5.1 3.8 1.5 0.3 setosa You can write citations, too. For example, we are using the bookdown package (Xie 2020) in this sample book, which was built on top of R Markdown and knitr (Xie 2015). References "]
+||||||| Initial commit
+["index.html", "A Minimal Book Example Chapter 1 Prerequisites", " A Minimal Book Example Yihui Xie 2020-07-25 Chapter 1 Prerequisites This is a sample book written in Markdown. You can use anything that Pandoc’s Markdown supports, e.g., a math equation \\(a^2 + b^2 = c^2\\). The bookdown package can be installed from CRAN or Github: install.packages(&quot;bookdown&quot;) # or the development version # devtools::install_github(&quot;rstudio/bookdown&quot;) Remember each Rmd file contains one and only one chapter, and a chapter is defined by the first-level heading #. To compile this example to PDF, you need XeLaTeX. You are recommended to install TinyTeX (which includes XeLaTeX): https://yihui.org/tinytex/. "],
+["intro.html", "Chapter 2 Introduction", " Chapter 2 Introduction You can label chapter and section titles using {#label} after them, e.g., we can reference Chapter 2. If you do not manually label them, there will be automatic labels anyway, e.g., Chapter 4. Figures and tables with captions will be placed in figure and table environments, respectively. par(mar = c(4, 4, .1, .1)) plot(pressure, type = &#39;b&#39;, pch = 19) Figure 2.1: Here is a nice figure! Reference a figure by its code chunk label with the fig: prefix, e.g., see Figure 2.1. Similarly, you can reference tables generated from knitr::kable(), e.g., see Table 2.1. knitr::kable( head(iris, 20), caption = &#39;Here is a nice table!&#39;, booktabs = TRUE ) Table 2.1: Here is a nice table! Sepal.Length Sepal.Width Petal.Length Petal.Width Species 5.1 3.5 1.4 0.2 setosa 4.9 3.0 1.4 0.2 setosa 4.7 3.2 1.3 0.2 setosa 4.6 3.1 1.5 0.2 setosa 5.0 3.6 1.4 0.2 setosa 5.4 3.9 1.7 0.4 setosa 4.6 3.4 1.4 0.3 setosa 5.0 3.4 1.5 0.2 setosa 4.4 2.9 1.4 0.2 setosa 4.9 3.1 1.5 0.1 setosa 5.4 3.7 1.5 0.2 setosa 4.8 3.4 1.6 0.2 setosa 4.8 3.0 1.4 0.1 setosa 4.3 3.0 1.1 0.1 setosa 5.8 4.0 1.2 0.2 setosa 5.7 4.4 1.5 0.4 setosa 5.4 3.9 1.3 0.4 setosa 5.1 3.5 1.4 0.3 setosa 5.7 3.8 1.7 0.3 setosa 5.1 3.8 1.5 0.3 setosa You can write citations, too. For example, we are using the bookdown package (Xie 2020) in this sample book, which was built on top of R Markdown and knitr (Xie 2015). References "],
+["literature.html", "Chapter 3 Literature", " Chapter 3 Literature Here is a review of existing methods. "],
+["methods.html", "Chapter 4 Methods", " Chapter 4 Methods We describe our methods in this chapter. "],
+["applications.html", "Chapter 5 Applications 5.1 Example one 5.2 Example two", " Chapter 5 Applications Some significant applications are demonstrated in this chapter. 5.1 Example one 5.2 Example two "],
+["final-words.html", "Chapter 6 Final Words", " Chapter 6 Final Words We have finished a nice book. "],
+["references.html", "References", " References "]
+=======
 ["aplicaciones.html", "Chapter 5 Aplicaciones 5.1 Ejemplo FORK 5.2 Example two", " Chapter 5 Aplicaciones Aqui se presentan algunos ejericios para practicar 5.1 Ejemplo FORK Situación: Gato tiene en su cuenta de GitHub un repositorio llamado mi_repo_genial y Perro ha visto este repositorio y quiere colaborar. Proceso de colaboración: 1. Perro debe hacer fork al repositorio de Gato 5.2 Example two "]
+>>>>>>> master
 ]