split file into smaller chunks

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This is the first chunk.
//
...
//
This is the third chunk.
//

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$/="//\n";
$count_records=0;
...
    $count_records++;
   
}

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"If $count_records<=999 --> print OUT1 $record"<br>
"If 1000<=$count_records<=1999 --> print OUT2 $record"<br>
"If 2000<=$count_records<=2999 --> print OUT3 $record"<br>

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