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  1. or download this
    open( FH , "+<" , $file )
  or die "Unable to open '".$file."' - $!\n";
  2. or download this
    open( my $fh , "+<" , $file )
  or die "Unable to open '".$file."' - $!\n";
  3. or download this
    open my $fh, '+<', $file
  or die "Unable to open '$file': $!\n";