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Using the 26 letters from the NATO alphabet might be easier, it's made to be intelligible for non-English speakers over a radio connection with static.

http://en.wikipedia.org/wiki/NATO_phonetic_alphabet

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Good starting point, but that won't get him trillions of combinations.

It does with 9 letters. In this case though I think I'd use them like a counter, so I would probably still top out at around 4 or 5.

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