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  1. or download this
    $x = '' unless defined($x)
  2. or download this
    my $x = '';
  3. or download this
    defined($x) or confess;
  4. or download this
    mysub($user_data)
{
  $user_$data->{invoice_number} ...
}
mysub({age => $user_age, inovice_number = $invoice_number}) # TYPO!
  5. or download this
    mysub($user_data)
{
...
  $user_$data->{invoice_number} ...
}
mysub({age => $user_age, inovice_number = $invoice_number}) # TYPO!