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Starting ID 1, command echo foobar
Error starting ID 1: Illegal seek at ./graphpipe.pl line 47.
...
Writing data to STDIN of 2
Use of uninitialized value within %child_inputs in ref-to-glob cast at
+ ./graphpipe.pl line 82.
Can't use string ("") as a symbol ref while "strict refs" in use at ./
+graphpipe.pl line 82.

{
   "Edges" : [
...
      }
   ]
}

#!/usr/bin/env perl

...
    }
    return;
}