delete_all example

/* delete_all(List,E,Result) means that Result is a a list just like List except all elements E are missing. */

delete_all([], E, []).

delete_all([E|Tail], E, Res) :- delete_all(Tail, E, Res).

delete_all([Head|Tail], E, [Head|Res]) :- delete_all(Tail, E, Res).

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