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I just tried for my first programming interview and one of the questions was to write a program that given a 7 digit telephone number, could print all possible combinations of letters that each number could represent.

A second part of the question was like what about if this would have been a 12 digit international number? How would that effect your design.

I don't have the code that I wrote in the interview, but I got the impression he wasn't happy with it.
What is the best way to do this?

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