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Power-Programmierung
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CD1.mdf
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prolog
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routine.pro
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1986-05-05
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384b
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12 lines
append([],L,L).
append([Z|L1],L2,[Z|L3]) :- append(L1,L2,L3).
printstring([]).
printstring([H|T]) :- put(H), printstring(T).
ret(X) :- X(_),retract(X(_)),ret(X).
ret(X) :- X(_,_),retract(X(_,_)),ret(X).
ret(X) :- X(_,_,_),retract(X(_,_,_)),ret(X).
ret(X) :- nl,print(X,' has been retracted').
/* final atn program */