in reply to Bidirectional lookup algorithm? (Updated: further info.)

While I was reading through the question and some of the answers, I couldn't stop thinking that a redis data structure server might be something to investigate. brian_d_foy wrote something about it lately and might be a handy starter.

And yes, I might be totally off track!

perl -ple'$_=reverse' <<<ti.xittelop@oivalf

Io ho capito... ma tu che hai detto?