what he said, here why:
entry: _ _ _ _
1st digit can be any of the 62 characters
2nd digit the same, same for the 3rd and the 4th
so its 62x62x62x62
no repetition it would be:
62 choices for the 1st digit x 61 choices for the 2nd digit x 60 choices for the 3rd digit x 59 choices for the 4th digit.
each time the choices has been decreased by 1 because it's taken by the preceding digit.
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Whatever you do, do it for the Lulz.
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