Thanks to everyone who helped! =)

@user21820 Ditto, to you, in return! You make a lot of good calls here!

Same to you!

Consider deletion: Contest problem... math.stackexchange.com/q/3550800/9003

Also consider closure (And I meant closure in my comment immediately above): math.stackexchange.com/q/3550811/9003

[ SmokeDetector | MS ] Bad keyword in answer, blacklisted website in answer, pattern-matching website in answer, potentially bad ip for hostname in answer, potentially bad keyword in answer, +1 more (261): Ice cream vendor problem by ireneiggs on math.SE

D1, D2, D3.

D4, D5, D6.

D7, D8, D9.

D10, D11, D12.

D13, D14, D15.

C1, C2, C3.

C4, C5, C6.

C7, C8, C9.

C10, C11, C12.

C13, C14, C15.

meta Should "How to draw Coxeter-Dynkin diagrams?" be reopened? The OP says in the comment that Coxeter-Dynkin diagrams and Dynkin diagrams are not the same thing. (I do not know much about either of them - although I have heard the name. So I am in no position to judge this.)

@Peter No, and this isn't really the right place to ask such a question (unless, of course, there is a post on MSE which includes this factoring "exercise", and which is in need of Closure, Reopening, Undeletion, Deletion, or Editing---in this case, please provide a link).

[ SmokeDetector | MS ] Link at end of answer (60): 0 order Logic Construction Sequence by Owais Raza on math.SE

Close HNQ and is probably a dupe

Maybe I'm just feeling "ornery" today, but it strikes me that we've seen quite a wave of PSQ's coming in.

Requesting closure. Please note the comments and two links to two additional posts from OP.

@amWhy The post I link to immediately above this comment has been deleted by the author.