built_in(!).
built_in('C'(_,_,_)).
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built_in((?- _)).
built_in(?=(_,_)).
built_in([]).
built_in([_|_]).
built_in(\+ _).
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built_in((_->_)).
built_in((_:-_)).
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built_in((_|_)).
built_in(_<_).
built_in(_=.._).
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built_in(_\==_).
built_in(_^_).
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built_in(abort).
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built_in(told).
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built_in(initialization(_)).