Question: How many possible Vigen re ciphers are there with key length 4 on the 6 2 - character alphabet abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ 1 2 3 4 5

How many possible Vigenre ciphers are there with key length 4 on the 62-character alphabet abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890?

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