* @throws RuntimeException if the posting fails
* @return a newly created constraint
*/
public Constraint postElement(Set[] arrayOfSets, Var indexVar, String oper, VarSet setVar) {
Constraint c = new ConstraintElementAtOnSets(setVar, arrayOfSets, indexVar);
c.post();
return c;
}
// /**
// * This method is defined for Set[] similarly to the "elementAt" for int[].