0 0	1 1
0 0     1 5
0 0     1 6
0 0	2 2
0 0     2 7
0 0     2 8
0 0	3 3
0 0	3 4
0 0     4 1
0 0     4 2
0 0     4 3
0 0     4 4
0 0     4 5
0 0     4 6
0 0     4 7
0 0     4 8
0
