Select Code to Download

##
## make_node()
...
   return $new_node;
}

$last_node = new_node('last', undef);
$middle_node = new_node('middle', $last_node);
$first_node = new_node('first', $middle_node);

sub traverse_nodes
{
...
    }
}

print join(' ', traverse_nodes($first_node) ), "\n";