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Suppose you have obtained the plaintext string (7, 0, 13, 3) and the corresponding ciphertext string (5, 20, 18, 18), and you know that a

Suppose you have obtained the plaintext string (7, 0, 13, 3) and the corresponding ciphertext string (5, 20, 18, 18), and you know that a Hill cipher with alphabet Z26 and block length 2 is used. Find the key.

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