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  1. or download this
    open my $FH_infile,  '<', "$in_file"  or die "Can't open $in_file";
open my $FH_outfile, '>', "$out_file" or die "Can't open $out_file";
  2. or download this
    open ( my $FH_infile,  '<', "$in_file" ) or
  die "Can't open $in_file";
open ( my $FH_outfile, '>', "$out_file" ) or
  die "Can't open $out_file";
  3. or download this
    open ( my $FH_infile,  '<', "$in_file" ) or
  die "Can't open $in_file: $!";
open ( my $FH_outfile, '>', "$out_file" ) or
  die "Can't open $out_file: $!";