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plz show all steps and circle answer Suppose there is a language that has only the letters a and b. The frequency of the letter

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Suppose there is a language that has only the letters a and b. The frequency of the letter a is 0.1 and the frequency of b is 0.9. A message is encrypted using a Vigenere cipher (working mod 2 instead of mod 26). The ciphertext is BABABABAAABA. Decrypt the message

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