decontamination

graph decontamination problem
git clone https://a3nm.net/git/decontamination/
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big (72B)

      1 0 1
      2 1 0
      3 1 2
      4 2 1
      5 2 3
      6 3 2
      7 0 4
      8 4 0
      9 4 5
     10 5 4
     11 5 6
     12 6 5
     13 0 7
     14 7 0
     15 8 7
     16 7 8
     17 8 9
     18 9 8