  4  8,  9  5,  3  1,  2  6, 10,  7
  1 10,  2  9,  3  8,  4  7,  5  6
  1
  1
 19  1,  3 17,  7 13, 14  6,  9 11, 10, 16  4, 18  2, 12  8, 15  5
 10,  1 19, 12  8,  5 15,  2 18, 17  3,  6 14, 13  7,  4 16, 11  9
