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Aug 12 at 1:49 comment added hgc Thank you! I edit it again.
Aug 12 at 1:47 history edited hgc CC BY-SA 4.0
added 41 characters in body
Aug 11 at 11:54 comment added Dave Benson I can't read your diagrams, but just add an extra loop marked $x$ at each vertex, and relations saying these loops square to zero and commute with all arrows that were already there.
Aug 11 at 8:55 comment added Jules Lamers (Did you actually check how your question compiles?)
Aug 11 at 7:34 history asked hgc CC BY-SA 4.0