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Decrypt the received encoded message [2"...

Decrypt the received encoded message `[2" "-3] [20 " "4] ` with the encryption matrix `[{:(-1,-1),(2,1):}]` and the decryption matrix as its inverse where the system of codes are described by the numbers 1-26 to the letters A-Z respectively, and the number 0 to a blank space.

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