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  1. or download this
    - foreach line $linenum
   - Compare the number of records returned by
...
     "SELECT DISTINCT * WHERE LINENUM=$linenum".
     If they're different, there are duplicate records.
- end
  2. or download this
    - foreach original file
  - $linenum = 1;
...
    with the number of lines in line###.dat.
    If they're different, there are duplicate records.
- end