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  1. or download this
     open (FH, "< $parent_index") or die "could not open file $parent_inde
+x for reading:$!";
  2. or download this
     open (FH, '<', $parent_index) or die "could not open file $parent_ind
+ex for reading:$!";
  3. or download this
     open (my $fh, '<', $parent_index) or die "could not open file $parent
+_index for reading:$!";