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Editorial Team
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Asked: 2026-05-14T01:12:16+00:00

I get several results with the same outputs. I want to get jack,jane only

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I get several results with the same outputs.

I want to get jack,jane only one time, but I get it two times.

How can I avoid this? I tried setof but I couldn’t get it done. Please can someone help me on this?

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1 Answer

  1. Editorial Team

    This question is duplicated in “How to stop repetitions in rules in prolog”.

    An answer is to do something like this:

    solve :-
    marriedcouple(Dad, Mum),
    not(found(marriedcouple(Dad, Mum))),
    assert(found(marriedcouple(Dad, Mum))),
    write([Dad, Mum]),
    nl,
    fail.

    Read the full answer for more detail.

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