_______________________________________________
	     | 1  |  2	   | 1	|	 | 1  |   2    | 1  |
	     |____|________|____|	 |____|________|____|
	     |	  |	   |	|	 |    |        |    |
	     | 2  |   3    | 2	|   4	 | 2  |   3    | 2  |
	     |____|________|____|________|____|________|____|
	     |	1 |   2    |  1 |    2	 | 1  |   2    | 1  |
	     |____|________|____|________|____|________|____|
	     |		   |	|	 |    |		    |
	     |	    4	   | 2	|   3	 |  2 |     4	    |
	     |_____________|____|________|____|_____________|
	     | 1* |   2*   | 1* |   2	 | 1  |   2    |  1 |
	     |____|________|____|________|____|________|____|
	     |	  |	   |	|	 |    |        |    |
	     | 2* |   3*   | 2* |   4	 | 2  |   3    | 2  |
	     |____|________|____|	 |____|________|____|
	     | 1* |   2*   | 1* |	 |  1 |   2    | 1  |
	     |____|________|____|________|____|________|____|