Codereview: All unique triplets

All unique triplets
I hope you found a solution that worked for you :)
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Thanks to all those great people for their contributions!

(codereview.stackexchange.com/users/287624/lolka0d)lolka0d
(codereview.stackexchange.com/users/170106/indi)indi
(codereview.stackexchange.com/users/263805/chris)Chris
(codereview.stackexchange.com/users/129343/g-sliepen)G. Sliepen
A special thanks goes out to the (codereview.stackexchange.com/questions/294218/all-unique-triplets)Stackexchange community

I wish you all a wonderful day! Stay safe :)
If anything is off, please write me at peter D.O.T schneider A.T ois42.de

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