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
AND-OR-Invert be represented by the boolean equation and truth table: formula_1 The 2-2 AOI gate will always output 0 if three or all four inputs are 1, and 1 if three or all four inputs are 0. A 2-1 AOI gate can be represented by following the boolean equation and truth table: formula_2 Larger AOI gates, such as 4-3 AOI or 3-3-3 AOI can also be used. AND-OR-INVERT(AOI) and OAI gates can be readily implemented in CMOS circuitry. AOI gates are particularly advantaged in that the total number of transistors (or gates) is less than if the AND, NOT, and OR