public static void Main()
for (int row = 0; row < 11; row++)
for (int col = 0; col < 11 + 2; col++)
if ((row == 0 && col >= 2 && col <= 4 || row == 0 && col >= 8 && col <= 10) ||
(row==1 && (col>=1 && col <=5 && col%4==1) || row==1 && (col >= 7 && col <= 11 && col % 4 == 3)) ||
(row >= 4 && (row - col == 4) || row >= 4 && (row + col == 16))