20
19
1111000000000001111
0111100000000011110
0111100000000011110
0111100000000011110
0011110000000111100
0011110000000111100
0011110000000111100
0001111000001111000
0001111000001111000
0001111000001111000
0000111000001110000
0000111100011110000
0000111100011110000
0000011100011100000
0000011110111100000
0000011110111100000
0000001110111000000
0000001111111000000
0000000111110000000
0000000111110000000
