<pre>-----------------------------------------
| 2 |   | 1 |   | 1 |   | 3 |   |   |   | 
-----------------------------------------
| &lt; | &gt; |   | 0 |   | &lt; | x | &gt; | 2 | 1 | 
-----------------------------------------
| 2 |   |   |   | 1 |   |   |   |   | o | 
-----------------------------------------
|   |   | 1 |   |   | 0 |   | ^ | 3 |   | 
-----------------------------------------
| o |   |   | ^ |   |   |   | v |   | 0 | 
-----------------------------------------
|   |   | 3 | x | 3 |   |   |   |   |   | 
-----------------------------------------
| o |   |   | v | 2 |   |   | 1 | o |   | 
-----------------------------------------
|   |   |   | 4 |   |   | 1 |   |   | 2 | 
-----------------------------------------
| 0 |   | &lt; | x | x | &gt; |   | 0 |   | ^ | 
-----------------------------------------
|   |   |   | 3 |   | 2 |   |   | 2 | v | 
-----------------------------------------</pre>