20
16
1111000000001111
1111100000001111
1111110000001111
1111110000001111
1111111000001111
1111111000001111
1111111100001111
1111011100001111
1111011110001111
1111001111001111
1111001111001111
1111000111101111
1111000011101111
1111000011111111
1111000001111111
1111000001111111
1111000000111111
1111000000111111
1111000000011111
1111000000011111
