What is the original message?

One method of encryption is to use a matrix to encrypt the message and then use the corresponding inverse matrix to decode the message. The encrypted matrix, E, is obtained by multiplying the message matrix, M, by a key matrix, K. The original message can be retrieved by multiplying the encrypted matrix by the inverse of the key matrix. That is,

(a) The key matrix  Find its inverse, K-1.
(b) Use the result from part (a) to decode the encrypted matrix
(c) Each entry in the result for part (b) represents the position of a letter in the English alphabet (A = 1, B = 2, C = 3, and so on). What is the original message?

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