code: public void skipSolver(ConstraintSolver ... solvers) {
  		if (solversToSkip == null) solversToSkip = new HashSet<ConstraintSolver>();
  		for (ConstraintSolver solver : solvers) solversToSkip.add(solver);
  	}
docs: Provide a list of solvers that should not process this constraint.
  @param solvers Solvers that should not process this constraint.