List<EventSet> eventSets = new ArrayList<EventSet>();
EventSet eventSet1 = new EventSet();
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("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));