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  1. or download this
    use strict;
use warnings;
...
build_graph();
print "SHOULD BE THE LAST THING PRINTED, HOWEVER ...\n";
__END__
  2. or download this
    BUILDING GRAPH
Neighbors
...
DESTROYING Node=HASH(0xfc414) 2
DESTROYING Node=HASH(0x104fbc) 1
DESTROYING Node=HASH(0xfc450) 3