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one more try
Authored by: SOX on Sep 17, '04 04:38:53PM

# identify duplicates that have same four first fields
$/ = "\r";
while ($d = <>) { 
     @F = split /\t/, $d ;
    $x = join " ::\t",@F[0..3]; 
    print $x,"\n" if $h{$x}++;

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