Ciphertext from challenge 4B
Fitness using tetragrams and the log formula found in https://www.cipherchallenge.org/wp-content/uploads/2022/09/Two-attacks-on-tableau-based-ciphers.pdf
Key 1 = CUSTOM – fitness = -9.62471350522921
key 2 = CUSTOP – fitness = -33.18946108835086