One duplicate vote missing here. – And this has also been asked and answered before.

[ SmokeDetector | MS ] Bad keyword in answer, blacklisted website in answer, pattern-matching website in answer, potentially bad ip for hostname in answer, potentially bad ns for domain in answer, +1 more (261): A pill bottle with large and small pills by vernonstes on math.SE

delete This is a strange case. This answer was downvoted and its author acknowledged that it is wrong, but never deleted it.

@amWhy Only D4 remains undeleted, but I can't help, since I had already cast a deletion vote.

@JoséCarlosSantos Thanks for the info!

This answer seems to be wrong. Don't know why its author never respondent to my comment.

On a scale of $1-10$ how well written is the question?

PSQ math.stackexchange.com/q/3562234/29335

Another more or less PSQ: math.stackexchange.com/questions/3562415/…

PSQ math.stackexchange.com/q/3562600/29335

@rschwieb Good call! Closed.