19
15
000001111110000
000111111111100
001110000001110
011000000000110
011000000000011
011000000000011
011100000000000
001111100000000
000111111110000
000001111111100
000000000111110
000000000000111
110000000000011
110000000000011
111000000000011
011100000000111
001110000001110
000111111111100
000001111110000
