0         1         2         3         4         5         6         7         8       
+---------+---------+---------+---------+---------+---------+---------+---------+---------+  
|         |         |         |         |         |         |         |         |         |

8 | | | | | | | | | | 8

|         |         |         |         |         |         |         |         |         |  
+---------+---------+---------+---------+---------+---------+---------+---------+---------+  
|         |         |         |         |         |         |         |         |         |

7 | | | | | | | | | | 7

|         |         |         |         |         |         |         |         |         |  
+---------+---------+---------+---------+---------+---------+---------+---------+---------+  
|         |         |         |         |         |         |         |         |         |

6 | | | | | | | | | | 6

|         |         |         |         |         |         |         |         |         |  
+---------+---------+---------+---------+---------+---------+---------+---------+---------+  
|         |         |         |         |         |         |         |         |         |

5 | | | | | | | | | | 5

|         |         |         |         |         |         |         |         |         |  
+---------+---------+---------+---------+---------+---------+---------+---------+---------+  
|         |         |         |         |         |         |         |         |         |

4 | | | | | | | | | | 4

|         |         |         |         |         |         |         |         |         |  
+---------+---------+---------+---------+---------+---------+---------+---------+---------+  
|         |         |         |         |         |         |         |         |         |

3 | | | | | | | | | | 3

|         |         |         |         |         |         |         |         |         |  
+---------+---------+---------+---------+---------+---------+---------+---------+---------+  
|         |         |         |         |         |         |         |         |         |

2 | | | | | | | | | | 2

|         |         |         |         |         |         |         |         |         |  
+---------+---------+---------+---------+---------+---------+---------+---------+---------+  
|         |         |         |         |         |         |         |         |         |

1 | | | | | | | | | | 1

|         |         |         |         |         |         |         |         |         |  
+---------+---------+---------+---------+---------+---------+---------+---------+---------+  
|         |         |         |         |         |         |         |         |         |

0 | | | | | | | | | | 0

|         |         |         |         |         |         |         |         |         |  
+---------+---------+---------+---------+---------+---------+---------+---------+---------+  
     0         1         2         3         4         5         6         7         8