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function($param1, \%param2);

sub function {
    if ($_[0] == 1) {
...
        do_something_else();
    }
}

my @list = keys %{ $href->{thing} };

my $thing = $hash{one}->{two};
my $other = $href->{one};

package Blah;
...
...
=head1 NAME
Blah - The thing with the guy and the place
...

=head2 method($param)

...
I<Mandatory, String>: The explanation of the formation of humanity in 
+a single string.

I<Return>: Hash reference, where each key is a continent, and its valu
+e is a colour. C<croak>s on failure.