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ID|LastName|FirstName|TimeIN|TimeOUT
0001|Flintstone|Fred|0900|1300
...
0002|Flintstone|Wilma|0900|1500
0002|Flintstone|Fred|0930|1100
0003|Rubble|Barney|0900|1100

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#load the data...
while(<FILE>){
...
        print "$_->{gender}\n";
    }
}