note Aristotle <blockquote><code> return $string . reverse $string; </code></blockquote> <p>That only generates even length palindromes. I instead suggest</p> <code> return ( $string . ( rand < .5 ? $letters[ rand @letters ] : '' ) . reverse $string ); </code> <p>Also, Don't Repeat Yourself. That's far too much copy-paste code there. Look at the benchmark script I wrote: much less code, and it tells you exactly which input strings each solution failed on and what it produced instead.</p> <div class="pmsig pmsig-114691"> <p align="right"><em>Makeshifts last the longest.</em></p> </div> 382567 383423