  In this work it is shown that 20 canonical amino acids (AAs) within genetic
code appear to be a whole system with strict AAs positions; more exactly, with
AAs ordinal number in three variants; first variant 00-19, second 00-21 and
third 00-20. The ordinal number follows from the positions of belonging codons,
i.e. their digrams (or doublets). The reading itself is a reading in quaternary
numbering system if four bases possess the values within a specific logical
square: A = 0, C = 1, G = 2, U = 3. By this, all splittings, distinctions and
classifications of AAs appear to be in accordance to atom and nucleon number
balance as well as to the other physico-chemical properties, such as
hydrophobicity and polarity.
