<story><title>When Is Cheryl&apos;s Birthday?</title><url>http://nbviewer.ipython.org/url/norvig.com/ipython/Cheryl.ipynb</url></story><parent_chain></parent_chain><comment><author>gkoberger</author><text>Maybe I&amp;#x27;m missing something, but the &amp;quot;hard&amp;quot; part of this problem is figuring on the trick. Once you know that, it becomes relatively easy – and you can&amp;#x27;t use a program to figure out the trick.</text></comment>
<story><title>When Is Cheryl&apos;s Birthday?</title><url>http://nbviewer.ipython.org/url/norvig.com/ipython/Cheryl.ipynb</url></story><parent_chain></parent_chain><comment><author>ghurtado</author><text>I thought this was a great puzzle when I first saw it. IMHO, it is more satisfying to &amp;quot;think through it&amp;quot; without paper and pencil, since it is relatively simple to resolve.&lt;p&gt;The Python solution proposed is really great, in that it captures both the expressive and functional spirit of the language.</text></comment>