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Asked: 2026-05-23T04:45:19+00:00

numbers([],[]). numbers([H|T],L):- ((H @>=10 , H @=<15) -> append(H,LI,L);true),numbers(T,LI). I am having problem there…

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numbers([],[]).
numbers([H|T],L):- ((H @>=10 , H @=<15) -> append(H,LI,L);true),numbers(T,LI).

I am having problem there… All H should be added at L list… but i cant achieve that!

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1 Answer

  1. Editorial Team

    append won’t work on an unbound LI. Try moving numbers(T, LI) first or remove append altogether by saying

    ((H @>=10 , H @=<15) -> L = [H|LI]; L = LI)
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