north: 80
south: 0
east: 100
west: 0
rows: 8
cols: 10
* * * * * * * * * * 
8 9 10 11 12 13 14 15 16 17 
9 10 11 12 13 14 15 16 17 18 
10 11 12 13 14 15 16 17 18 19 
* * * * * * * * * * 
12 13 14 15 16 17 18 19 20 21 
13 14 15 16 17 18 19 20 21 22 
14 15 16 17 18 19 20 21 22 23