This Note follows from Note 1 and it shows further distinctions and splittings within four diversity types of protein amino acids (AAs). First type as in Note 1 (G, P) and second one, also as in Note 1 (A, L; V, I). Within third type there is a chemicaly directed splitting into 4 + 2 AAs [(F, Y, H, W) + (C, M)]. Forth type consists of two halves in form of 4 + 4 AAs; four AAs with nitrogen, and four without: [(N, Q; K, R) + ( S, T, D, E)]. All these distinctions are followed by specific arithmetical regularities.