private boolean playerStartPositionsHasNoTeleporter(Grid grid) {
		List<Teleporter> teleporters = getTeleportersOfGrid(grid);
		
		for (Player p : grid.getAllPlayersOnGrid())
			for (Teleporter teleport : teleporters)
				if (grid.getElementPosition(teleport).equals(p.getBeginPosition()))
					return false;
		
		return true;
	}