Find pronounceable letter mnemonics for phone numbers.

This program uses a table of pronounceable letter-triples derived from a dictionary scan. Each potential mnemonic must be such that all of its letter-triples are in the table to be emitted. About 30% of possible triples are considered pronounceable. A typical 7-digit phone number has 19,683 possible mnemonics, but this test usually cuts the list down to a few hundred or so, a reasonable number to eyeball-check. For some numbers, the list will, sadly, be empty.


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