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  1. or download this
        next unless /$V/;
  2. or download this
    C:\test>1036737 -V=500 < numbers.tsv
Took 19.138550 seconds ## without pre-filter
...
C:\test>1036737 -V=500 < numbers.tsv
Took 1.755853 seconds ## with pre-filter
Kept 2005 records
  3. or download this
    C:\test>1036737 -V=5 < numbers.tsv
Took 18.765492 seconds ## Without pre-filter
...
C:\test>1036737 -V=5 < numbers.tsv
Took 20.232294 seconds ## With pre-filter
Kept 1944 records