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Note that the numbering of rows and columns is zero based, with the origin in the upper-left corner:
0 1 2
*-----------*-----------*-----------*
0 | | | |
| | | |
| *-----------*-----------*
1 | | | |
| | | |
*-----------* *-----------*
2 | | | |
| | | |
| | *-----------*
3 | | | |
| | | |
| | *-----------*
4 | | | |
| | | |
*-----------*-----------*-----------*