The 16 standard stacks

Signs alternate. Letter shape is PJJP or JPPJ (not strict PJPJ): positions 1–2 mix one perceiving and one judging letter; 3 is the other of 2’s kind; 4 is the other of 1’s kind. One function per quadrant.

#	Stack	Pattern	P/J	Shadow twin
1	Ne-Fi-Te-Si	+N −F +T −S	PJJP	ni-fe-ti-se
2	Ne-Ti-Fe-Si	+N −T +F −S	PJJP	ni-te-fi-se
3	Se-Fi-Te-Ni	+S −F +T −N	PJJP	si-fe-ti-ne
4	Se-Ti-Fe-Ni	+S −T +F −N	PJJP	si-te-fi-ne
5	Fe-Ni-Se-Ti	+F −N +S −T	JPPJ	fi-ne-si-te
6	Fe-Si-Ne-Ti	+F −S +N −T	JPPJ	fi-se-ni-te
7	Te-Ni-Se-Fi	+T −N +S −F	JPPJ	ti-ne-si-fe
8	Te-Si-Ne-Fi	+T −S +N −F	JPPJ	ti-se-ni-fe
9	Ni-Fe-Ti-Se	−N +F −T +S	PJJP	ne-fi-te-si
10	Ni-Te-Fi-Se	−N +T −F +S	PJJP	ne-ti-fe-si
11	Si-Fe-Ti-Ne	−S +F −T +N	PJJP	se-fi-te-ni
12	Si-Te-Fi-Ne	−S +T −F +N	PJJP	se-ti-fe-ni
13	Fi-Ne-Si-Te	−F +N −S +T	JPPJ	fe-ni-se-ti
14	Fi-Se-Ni-Te	−F +S −N +T	JPPJ	fe-si-ne-ti
15	Ti-Ne-Si-Fe	−T +N −S +F	JPPJ	te-ni-se-fi
16	Ti-Se-Ni-Fe	−T +S −N +F	JPPJ	te-si-ne-fi