if (oldProblem.getMessage().equals(iProblem.getMessage()))
if (! oldProblem.getMessage().equals(iProblem.getMessage()))
	private static boolean isCorresponding(IProblem oldProblem, IProblem iProblem) {		if (oldProblem.getID() != iProblem.getID())					return false;		if (oldProblem.getMessage().equals(iProblem.getMessage()))				return false;		return true;	}