Suppose you have a language with only the three letters a, b, c, and they occur with frequencies 0.7, 0.2 and 0.1, respectively. The following ciphertext was encrypted by the Vigenere method (shifts are mod 3 instead of mod 26): ABCBABBBAC
You are told that the key length is 1, 2, or 3. Show that the key length is probably 2, and determine the most probable key.

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