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There are 95 possible password characters: 52 letters, 10 digits, and 33 special characters. A valid password must contain at least one letter, at least

There are 95 possible password characters: 52 letters, 10 digits, and 33 special characters. A valid password must contain at least one letter, at least one digit, and at least one special character. How many valid 8-character passwords are there?

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