decontamination

graph decontamination problem
git clone https://a3nm.net/git/decontamination/
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linei (204B)

      1 0 1
      2 1 0
      3 1 2
      4 2 1
      5 2 3
      6 3 2
      7 3 4
      8 4 3
      9 4 5
     10 5 4
     11 5 6
     12 6 5
     13 6 7
     14 7 6
     15 1 8
     16 8 1
     17 1 9
     18 9 1
     19 8 10
     20 10 8
     21 8 11
     22 11 8
     23 3 12
     24 12 3
     25 12 13
     26 13 12
     27 3 14
     28 14 3
     29 14 15
     30 15 14
     31 6 16
     32 16 6
     33 16 17
     34 17 16
     35 6 18
     36 18 6
     37 18 19
     38 19 18
     39 18 20
     40 20 18
     41 20 21
     42 21 20