Fixed Wikipedia link

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@@ -669,7 +669,7 @@ <h3>
 &nbsp;&nbsp;&nbsp; Wise hackers smile like tigers.
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-&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; --a <a href="http://en.wikipedia.org/wiki/Waka_%28poetry%29#Tanka" id="s3k3" title="tanka">tanka</a>, or extended haiku
+&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; --a <a href="https://en.wikipedia.org/wiki/Waka_%28poetry%29#Forms_of_waka" id="s3k3" title="tanka">tanka</a>, or extended haiku
 
 </p>
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