20
19
0000000111111100000
0000111111111111000
0001111111111111100
0011111111111111110
0111111000000111111
0111110000000011111
0111100000000001100
1111000000000000000
1111000000000000000
1111000000111111111
1111000000111111111
1111000000111111111
1111000000111111111
0111100000000001111
0111110000000001111
0111111000000111111
0011111111111111111
0001111111111111110
0000111111111111000
0000000111111100000
