Ilmari Karonen wrote: > However, the output of either program isn't particularly interesting, > since there's a lot of repetition. The reason for that is > that for any Bullean pair ($a, $b), ($a.$c, $b) is also a Bullean > for any string $c. Not quite. 'good' & 'bad' is a Bullean pair yielding 'bad', but 'good' & 'bad4' will not yield 'bad' nor 'bad4' -- it gives 'bad$'. For length($a)>=length($b), your description will hold, I think. Cheers, Philip -- Philip Newton <Philip.Newton@datenrevision.de> All opinions are my own, not my employer's. If you're not part of the solution, you're part of the precipitate. ==== Want to unsubscribe from Fun With Perl? Well, if you insist... ==== Send email to <fwp-request@technofile.org> with message _body_ ==== unsubscribe