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I think everyone is completely missing the reason behind the omission of Q and Z.

Due to the database storage engine they chose, it was necessary to put a limitation on the number of Scrabble points that a password would award.

Q and Z are both 10-pointers, so passwords with them frequently blew past the limit. You can use J and X, but that's really pushing it.

And the "cannot contain three repeating character" rule is due to that being the trigger for the stored procedure that implements 'triple word score'.



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