Fun project but fuzzy on logic. "PhoneCALLs"

[Dar Scott]

I'm assuming you are not checking that a string of letters are real 
words.

The list of possible "words" for a phone number is...

... simply empty of the phone number is empty.

... otherwise get the list of all possible words for the phone number 
excluding the first digit and then put the letters for the first digit 
in front of copies and concatenate those for the result.

Maybe there is a cleaner way.

Dar Scott