@MartinSleziak I was a bit unsure about voting to close as a duplicate in this particular case but it seems that at least some users agreed with me.

[ SmokeDetector | MS ] Bad keyword with email in answer: What is the correct way to self learn from a textbook? by Steve Honecker on math.stackexchange.com

[ SmokeDetector | MS ] Few unique characters in answer, no whitespace in answer, repeating characters in answer: Proof of Green's identity by dic_golzalus on math.stackexchange.com