Hello! First post here on the forums.
I've been pretty self-sufficient with the built-in documentation but am stuck on a current project.
Here's my problem: I have a list (we'll call it A) of lists generated by Tuples. The inner lists are of length 4, and I want to select all elements from A such that if #[]==#[] then #[]!=#[]. So I want all elements of A such that if the first element matches the third, then the second element doesn't match the fourth.
Thanks in advance!