18
15
000011111100000
000111111111000
001111111111100
011110000011110
011100000001110
011110000000000
011111100000000
001111111100000
000111111111000
000001111111110
000000001111110
000000000001111
111000000000111
111100000000111
011110000001111
011111111111110
001111111111100
000011111110000
