Jeff Moden (10/27/2012)
I wonder how many 3 and 4 letter swear words such a proccess will actually spell out.I strongly recommend not using incrementing alpha-numerics for just such a reason but if you do, you really need to avoid the use of vowels at the very least.
There are plenty of consonants that make swear words out of nothing (V, Y, K). I certainly don't want to be customer Foxtrot Victor Charlie Kilo. There are also others that seems harmless until you put them together VYLE. I probably am vile but don't want that to be my customer number. So much safer to stick arbitrary digits.
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