Vala, or The Four Zoas the histories of the Druids and of the Christians along with adding various locations connected to them. In both editions of the poem, Blake changed his mythological system in the "Book of Urizen" from a dualistic struggle between two divine powers to a struggle of four aspects split from Eternity. These aspects are Blake's Four Zoas, which represent four aspects of the Almighty God and "Vala" is the first work to mention them. In particular, Blake's God/Man union is broken down into the bodily components of Urizen (head), Urthona (loins), Luvah (heart), and Tharmas (unity of the body) with paired
Four-square cipher the assumed language of the original message. Cryptanalysis of four-square generally involves pattern matching on repeated monographs. This is only the case when the two plaintext matrices are known. A four-square encipherment usually uses standard alphabets in these matrices but it is not a requirement. If this is the case, then certain words will always produce single-letter ciphertext repeats. For instance, the word MI LI TA RY will always produce the same ciphertext letter in the first and third positions regardless of the keywords used. Patterns like these can be cataloged and matched against single-letter repeats in the ciphertext. Candidate