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May 7 at 16:25 comment added Najib Idrissi @azerbajdzan You could always check if the graph satisfies AcyclicGraphQ, return TopologicalSort if that's the case, and fail otherwise.
May 7 at 16:24 vote accept azerbajdzan
May 7 at 16:23 comment added azerbajdzan Nice, it returns unevaluated TopologicalSort if rules are contradictory, i.e. no solution exists.
May 7 at 16:14 history answered Najib Idrissi CC BY-SA 4.0