There is one more point in it though. Mostly it will work even without strict following the rules. Severity of legislation is compensated with its avoidability. Typical.
Code:Nouns Adjectives -1 (except 11) Sn Nom/Acc Sn Nom/Acc -2, -3, -4 Sn Gen Pl Gen or (except -12, -13, -14) Pl Nom/Acc Rest Pl Gen Pl Gen