20
16
1111111111111111
1111111111111111
1111111111111111
1111111111111111
0000001111000000
0000001111000000
0000001111000000
0000001111000000
0000001111000000
0000001111000000
0000001111000000
0000001111000000
0000001111000000
0000001111000000
0000001111000000
0000001111000000
0000001111000000
0000001111000000
0000001111000000
0000001111000000
