How should I understand Anicca / Anitya & Anatta / Anatman

There is always a confusion on Anitya and Anicca on which of them is correct? Also the confusion is there on Anatta with Anātman. Where in sutta can we get this information? The discussion is on that and fully covered when one discerns or penetrates on paccayasutta https://suttacentral.net/sn12.20/en/sujato Another important sutta where we have to understand is Anattalakkhanasutta where one should be able to know for oneself what is "anatta". By penetrating anatta, one can understand dukkha and what remains is "anicca" and that would be the perception instead of "nicca" perception. https://suttacentral.net/sn22.59/en/sujato