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Special Characters in Mixed Case

Write it down, this doesn't record what it creates.

Zero "0" and u.c. "O" won't appear together. In mixed case, that is a zero (0).
One "1" and u.c. "I" won't appear together either. In mixed case, that is a one (1).
One "1" and l.c. "l" won't appear together either. In mixed case, that is a one (1).