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<DT class="pubdef"><A NAME="constraint/4"><STRONG>constraint</STRONG>(<VAR>+Name,
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+Constraint, +S0, -S</VAR>)</A></DT>
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and attaches the name <VAR>Name</VAR> (an atom or compound term) to the
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<DT class="pubdef"><A NAME="constraint_add/4"><STRONG>constraint_add</STRONG>(<VAR>+Name,