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  1. or download this
    - open (my $F, $file) or die "cannot open file $!";
+ open (my $F), '<', $file or die "cannot open file $!";
  2. or download this
    open (my $F), '<', $file
  or warn "cannot open file '$file': $!";
defined $F
  or next;
  3. or download this
    open (my $F), '<', $file
  or warn "cannot open file '$file': $!" and next;