use round brackets for meta_predicate/1 declaration
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@@ -28,7 +28,7 @@ dif(X, Y, T) :-
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non(true, false).
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non(false, true).
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:- meta_predicate tfilter(2, ?, ?).
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:- meta_predicate(tfilter(2, ?, ?)).
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tfilter(C_2, Es, Fs) :-
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i_tfilter(Es, C_2, Fs).
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