In addition, there is at least an analogy (correspondence?) with the result of the distribution of AAs on four stereochemical types (031, 041, 051, 061, 071), where "quantization" is with the same change for a second-order unit in the quantity notation (Table , on the right, in relation to Figure ). With an insight into the fact that the quantities in the arrangement on Table are literally "taken off" from the diagonal of PSN (Figure ), there can no longer be any doubt that semiotic arbitrariness is an essential feature of the Genetic Code; nor that the genetic code represents the unity of chemical and non-chemical entities; finally, there can be no doubt that GC itself, in total, represents a kind of semiotic system. * Because of those readers (because of that part of the scientific public) who will think that the views just presented were adopted too quickly, and that they are also too optimistic, we believe that we should go a step further in testing the PPAASS arrangement. The best way to do this is for the test to be one possible (chemically justified) pairing of AAs. Can the resulting sequence of 10 AAs pairs also satisfy R. Swanson's requirement of ideality and perfection, but also our requirement to simultaneously express both the chemical properties and the semiotic essence of the amino acid code; in other words, to get: SSAAPP (Similarity System of Amino Acid Perfect Pairs). But then the question arises, whether the pairing that is contained in PPAASS, and which, obviously, has a chemical justification (GA, VP, IL, KR, QE, etc.) (Table ), but does not take into account the distinctions of AAs into four stereochemical types nor into four types of diversity (Figure and Table in this paper); or so that these two distinctions are taken into account? The test showed that the latter (taking into account both: the four stereochemical types, as well as the four types of diversity of protein AAs) is correct (Tables and.1). * Table .1 shows how the sequence of 10 pairs is constituted in SSAAPP (Table ). When deciding on the order and position of the pairs, both classifications of amino acids had to be taken into account: classification into four stereochemical types, as well as in four types of diversity. Thus, at first there must come pairs from the set of 16 AAs of the alanine type, and, at the end their four chalcogen, 2 oxygenic and 2 sulfuric, because sulfur comes from the third group of the periodic system of chemical elements, while the previous pairs posses only elements from the first and second periods. Only after that come AAs from the remaining three stereochemical types. As we are dealing with pairs here, one would think that glycine and proline (GP) go together, since they are singlets, each in its stereochemical type, and as we find them in the basic setup of the four types of diversity (Figure ). Also the valine-isoleucine pair (V-I) appears to be predetermined, as these are the only two AAs in the valine type. However, it is not so. The analysis showed that the third key must be included here, which is the key of classification of AAs into two classes handled by two classes of enzymes aminoacyl-tRNA synthetases (aaRS). The same key had to be used when pairing .