In coding a message, a blank space was represented by 0, an A by 1, a B by 2, a C by 3, and so on. The message was transformed using the matrix
and sent as
− 19, 19, 25,−21, 0, 18,−18, 15, 3, 10,
− 8, 3,−2, 20,−7, 12
What was the message?
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