[ SmokeDetector | MS ] Bad keyword in body (95): what does it mean by 'ridged change'? by Klaus on ell.SE

Does this sentence sound natural? "The red edges mean the two nodes having each of them contradict to each other."

@Ooker contradict is a transitive verb, so "contradict to" doesn't work

apart from that, I am not entire sure what you are trying to say...

btw, I recommend posting on the ELL main site, cuz not a lot of ppl are active in this chat room