Constraint * generateEquivConstraint(Constraint *var1, Constraint *var2) {
Constraint * imp1=allocConstraint(OR, negateConstraint(cloneConstraint(var1)), var2);
Constraint * imp2=allocConstraint(OR, var1, negateConstraint(cloneConstraint(var2)));
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+
return allocConstraint(AND, imp1, imp2);
}