% Author: Thomas Stroeder % terminating %query: app(i,o,o). app([],Y,Y). app(X,Y,[H|Z]) :- no(empty(X)), head(X,H), tail(X,T), app(T,Y,Z). head([],_). head([X|_],X). tail([],[]). tail([_|Xs],Xs). empty([]). no(X) :- X, !, failure(a). no(_). failure(b).
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