Suppose you intercept the ciphertext

ZAGXE NGUFO HMGXE NOAOW IRFCQ NOYAF FPBDF CSXMU

which was known to be enciphered by a key matrix using a Hill cipher. Suppose you somehow guess that the first four letters of the ciphertext resulted from the plaintext letter crib given by FIND. Recover the key matrix and decipher the message.