flags2

1 2 3 4 5 6 7 8 9 10 / to-remove
0 1 1 0 0 1 0 1 0 1   1
  0 1 0 0 1 0 1 0 1   2
    0 0 0 1 0 1 0 1   3
      1 0 1 0 1 0 1   5
      0   0 0 1 0 1   4
          1 0 1 0 1   7
          0   0 0 1   6
              1 0 1   9
              0   0   8
                  1   / not converging