Quadras can be split into two subquadras: for example, the alpha quadra has 8 different types: ESFj and ESFj ...and we can arrange these 8 types into two groups:
way #1 (rationals and irrationals)
INTj ESFj ISFp ENTp
INTj ESFj ISFp ENTp
way #2 (accepting and producing)
INTj ESFj ENTp ISFp
INTj ESFj ENTp ISFp
IRL, I find myself from time to time in the producing quadra (way #2), since I know more producing types than their accepting counterparts. What about you?