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May 2018 - Solution
Alex Fleischer sent us an ILOG solution (thanks again). It makes solving this challenge look so easy...
Alexander Raß proved that there are two types of solution:
ABC-DEF BEH-CDJ DGH-EIJ AGI-FHJ and ABC-DEF DGH-EIJ AGI-BHJ CDEHI-ABFGJ