20
19
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0000111111111110000
0001111111111111000
0011111111111111100
0111111000001111110
0111110000000111110
1111100000000011111
1111000000000001111
1111000000000001111
1111000000000001111
1111000000000001111
1111000000000001111
1111000000000001111
1111100000000011111
0111110000000111110
0111111000001111110
0011111111111111100
0001111111111111000
0000111111111110000
0000001111111000000
