20
16
0111100000011110
0111110000111110
0011110000111100
0001111001111000
0001111001111000
0000111111110000
0000111111110000
0000011111100000
0000001111000000
0000001111000000
0000011111100000
0000111111100000
0000111111110000
0001111001111000
0001111001111000
0011110000111100
0011110000111100
0111100000011110
1111100000011111
1111000000001111
