I’m using: SWI-Prolog version 7.6.4 I want the code to: output all solutions. But what I’m getting is: duplicates and wrong solutions My code looks like this: % % 8 friends are sitting at a round table. % seating(Friends) :- length(Friends, 8), member(bruce, Friends), % One o…

Have you tried using trace to step through your code? You are also calling your predicates in different modes. e.g. inbetween with a mixture of grounded and variable terms, do your predicates support being called in that mode? Try testing them out individually with different modes. For example, is…

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EricGT November 11, 2021, 4:57pm 6

You should consider upgrading to a newer version. For Windows and Ubuntu it is relatively easy, I don’t use Mac so can’t speak about that.

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