Shorten the solution of combineLists in ch11 #9
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`combineLists other Empty = other` isn't needed: in case the second list is empty, it'll be pattern matched against `combineLists (Value v rest) other` and go on in this way until the first List is Empty.
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combineLists other Empty = otherisn't needed: in case the second list is empty, it'll be pattern matched againstcombineLists (Value v rest) otherand go on in this way until the first List is Empty.