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Number of nodes: 4
Number of combinations tried: 3
...
solution: <0 3 4 6 9 12 14 18 19 22 23 25 26 27 28 31>
<1 2 5 7 8 10 11 13 15 16 17 20 21 24 29 30>
dataflow: 10701 lapsed time=116933.583916 s (32.48 hrs)

use strict;
use warnings;
...
    print "$sRow\n";
  }
}