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?

In reply to Re: Bidirectional lookup algorithm? (Updated: further info.) by polettix
in thread Bidirectional lookup algorithm? (Updated: further info.) by BrowserUk

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