How Many Passwords?!

People who register accounts at a certain site are given unique four-character passwords with which to log-in. Two of the characters of the password are letters ('A', 'B', 'C', etc.) while the other two are numerical digits (0~9). However, the letters and numbers can be in any order. What is the maximum amount of accounts that can be made on the website if repeated characters are allowed in the passwords?

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