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#In this example, the 13 digit bill numbers are right after the date (
+20061212), eg. 123456789A101, C234567891011, A001122334455. The heade
+r line starts with 101010000 and bill details line starts with 301033
+000. The end of bill details line is identified by 999999.
101010000ABC    20060212123456789A1018880001000000001    123456789A101
+00216       4322489239649  342    10  00000    20060212              
+                     
...
309990000Z98765420060212A0011223344558880001000000009    1TAX  TAX APP
+LICATION
999999        200601161635         30

use warnings;
use strict;
...
"\n"
        if exists $bills{$bill}{'data'};
}