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by dragonwriter 4415 days ago
They also can't contain symbols (so apparently just digits and letters except Q and Z). The combination suggests to me the horrible possibility that they actually reduce the password to just digits for storage, and to support entry on devices that look like old touchtone phones [1] (I say "old" because newer ones usually have "PQRS" instead of "PRS" and "WXYZ" instead of "WXY"):

[1] Like: http://www.cs.utexas.edu/users/scottm/cs307/utx/assignment5....