A few weeks ago, someone I know was trying to solve a somewhat interesting problem (interesting to me, at least). They wanted to know all the words that could be formed from all the combinations of the last 4 digits of a phone number.
When I first read this, I thought you meant actual words, in a dictionary, but it sounds like you mean combinations. Just an aside, if someone wants to limit this to actual words, it's pretty trivial with something like...
perl -lne 'if (/^[a-p,r-y]{4}$/i) {($a = lc $_) =~ tr/[a-p,r-y]/222333
+444555666777888999/; print "$_: $a"}' < /usr/share/dict/words
If the dictionary has more than one entry for the same word (i.e. capitalized and not), then you'll see it more than once, so putting things in a hash might help.
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