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abolish (X) :- elan (abolish, X).
append ([], X, X) :- !.
append ([X|Y], Z, [X|W]) :- append (Y, Z, W).
atom (X) :- functor (X, Y, 0).
atomic (X) :- atom (X); integer (X).
consult (X) :- elan (consult, X).
end :- bye.
fail :- [].
findall (X, Y, Z) :- tell ("$$"), write ("[ "), findall (X,Y);
write (" ]"), told, see ("$$"), read (Z),
seen, elan (forget, "$$").
findall (X, Y) :- call (Y), writeq (X), write (","), [].
integer (X) :- functor (X, Y, -1).
listing (X).
member (X, [X|Z]).
member (X, [Y|Z]) :- member (X, Z).
nl :- elan (line).
non var (X) :- var (X), !, []; .
not (X) :- call (X), !, []; .
notrace :- elan (trace, off).
reconsult (X) :- elan (reconsult, X).
repeat.
repeat :- repeat.
see (X) :- elan (sysin, X).
seen :- elan (sysin, "").
tab (X) :- tab(X,1).
tab (X,Y) :- Y<=X, !, put (32), incr(Y), tab(X,Y);.
tell (X) :- elan (sysout, X).
told :- elan (sysout, "").
trace :- elan (trace, on).
true.
< (X, Y) :- <= (X, Y), <> (X, Y).
> (X, Y) :- <= (Y, X).
>= (X, Y) :- < (Y, X).
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