Yeah, I first heard about them while reading writeups from <a href="http:&#x2F;&#x2F;save-endo.cs.uu.nl&#x2F;" rel="nofollow">http:&#x2F;&#x2F;save-endo.cs.uu.nl&#x2F;</a> and spent quite a while trying to figure out how so many of the contestants knew about them and how I would have found them by Googling (never was successful). I think it would have been easier to find them now in 2016… I&#x27;ve seen lots of implementations floating around :-)