% Adapted from LP/talp_dds/duplicate.pl % terminating %query: duplicate(i,o). duplicate([],[]). duplicate(X,[H|[H|Z]]) :- no(empty(X)), head(X,H), tail(X,T), duplicate(T,Z). head([],_). head([H|_],H). tail([],[]). tail([_|T],T). empty([]). no(X) :- X, !, failure(a). no(_). failure(b).
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