so, ( and because Stat names may vary in the future ) I will call stats as stat_1, stat_2 etc, or simply 1,2,3,4,5,6
to build a class we combine two stats :
12,13,14,15,16, (21=12) 23,24,25,26,34,35,36,45,46,56 ===> there is room for 15 classes;
to build a multiclass we combine three classes ...