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30. (Bonus) The plaintext BONUS PROBLEM gets encrypted to QF434Q6.1FJJXTS, and the Hill Cipher key is nine characters long. Decrypt the message V.8Y_Q063163.15.

30. (Bonus) The plaintext "BONUS PROBLEM" gets encrypted to "QF434Q6.1FJJXTS", and the Hill Cipher key is nine characters long. Decrypt the message "V.8Y_Q063163.15".

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