public boolean add(Group group) { if (contains(group)){ return false; } else { idMap.put(group.getId(), group); return true; } }
public boolean add(Group group) { return wrappedSet.add(group);  }
	public boolean add(Group group)    {        if (contains(group)){            return false;                    }        else {            idMap.put(group.getId(), group);            return true;        }    }