remove unneeded single quotes
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@@ -75,7 +75,7 @@ dot(Term) :-
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dot(Term, []).
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dot(Term, NVs) :-
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phrase(term_labels(Term, NVs, 'c'), Ls),
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phrase(term_labels(Term, NVs, c), Ls),
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phrase(("graph G {\n",
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dots(Ls),
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"}\n"), DOT),
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