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my($webcrawler, $hook, $url, $response, $structure) = @_;

$webcrawler = @_;
$hook=@_;
...
.
.
$structure=@_;

($webcrawler, $hook, $url, $response, $structure) = @_;

$webcrawler = $_[0];
$hook       = $_[1];
$url        = $_[2];
$response   = $_[3];
$structure  = $_[4];