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  1. or download this
        sub greet {
      my ($name, $age) = @_;
...
      print "Hello, there $name. How does it feel to be $age?\n";
    }
  2. or download this
        use Params::Validate qw(:all);
    sub greet {
...
    print "Hello, there $name. How does it feel to be $age?\n";
  3. or download this
     sub HTML::Element::iter2 {

...
            },
      # output debug info? by default, no
      debug => {default => 0}