Question: A long string of ciphertext resulting from a Hill cipher C 1 aP 1 + bP 2 ( mod 2 6 ) C 2 -

A long string of ciphertext resulting from a Hill cipher
C1 aP1+ bP2(mod 26)
C2- cP1+ dP2(mod 26)
revealed that the most frequently occurring two-letter blocks were HO and PP, in that
order.
(a) Find the values of a, b, c, and d.

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