public int numOwners(){
		int ownerCounter = 0;
		ArrayList<String> nameOfOwners = new ArrayList<String>();
		for(int i = 0; i < listOfUnits.size(); i++){
			nameOfOwners.add(listOfUnits.get(i).getOwner().getName());
			ownerCounter++;
		}

		for(int i = 1; i < nameOfOwners.size(); i++){
			for(int j = i; j < nameOfOwners.size(); j++){
				if(nameOfOwners.get(i-1).equals(nameOfOwners.get(j))){
					ownerCounter--;
					nameOfOwners.remove(i);
				}
			}
		}

		return ownerCounter;
	}