19
15
111100000001111
111110000001111
111110000001111
111111000001111
111111000001111
111111100001111
111111110001111
111101110001111
111101111001111
111100111001111
111100111101111
111100011101111
111100011111111
111100001111111
111100000111111
111100000111111
111100000011111
111100000011111
111100000001111
