eventSet1.addEvent(new Event("A", null));
eventSet1.addEvent(new Event("A", null));
eventSet1.addEvent(new Event("A", null));
eventSet1.addEvent(new Event("A", null));
eventSet1.addEvent(new Event("B", null));
eventSet1.addEvent(new Event("B", null));
eventSet1.addEvent(new Event("B", null));
eventSet1.addEvent(new Event("C", null));
eventSets.add(eventSet1);
EventSet eventSet2 = new EventSet();
eventSet2.addEvent(new Event("A", null));