negotiation by failure- list operations

hi, what im trying to do is the following:


delete1(X,L1,L2) that uses delete(X,L1,L2) but if X isnt in L1 it
should not throw NO - it should only throw YES

i think its donesimilar to that predicate:
different(X,Y) :- X=Y, !, true.
different(X,Y).

but how do i change my delete1 predicate that it throws YES if X isnt
in L1 ?


Can someone help me ?

.

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