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Alice encrypts the message (P_1, \ldots, P_5)(P 1 ,…,P 5 ). Unfortunately, the block C_2C 2 of the ciphertext is lost in transmission, so that Bob recieves (C_0, C_1, C_3, C_4, C_5)(C 0 ,C 1 ,C 3 ,C 4 ,C 5 ). Assuming that Bob knows that he is missing the second ciphertext block C_2C 2 , which blocks of the original plaintext can Bob recover?

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