12 12

  0   4 999 999   3 999 999 999 999 999 999 999
  4   0   1 999 999 999   2 999 999 999 999 999
999   1   0   1 999 999 999   2 999 999 999 999
999 999   1   0 999 999 999 999 999 999 999 999
  3 999 999 999   0   1 999 999   1 999 999 999
999 999 999 999   1   0   2 999 999   2   3 999
999   2 999 999 999   2   0 999 999 999   3 999
999 999   2 999 999 999 999   0 999 999 999 999
999 999 999 999   1 999 999 999   0 999 999 999
999 999 999 999 999   2 999 999 999   0 999 999
999 999 999 999 999   3   3 999 999 999   0   1
999 999 999 999 999 999 999 999 999 999   1   0