19
15
110000000001110
110000000011100
110000000111000
110000001110000
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110000111000000
110001110000000
110011100000000
110111110000000
111111110000000
111100111000000
111000011100000
110000011100000
110000001110000
110000000111000
110000000011100
110000000011100
110000000001110
110000000000111
