$array[0]= "A01";
$array[1]="A02";

##</code><code>##

@arrayletterlist = qw(A B C D E F G H);
@arraynumberlist = qw(01 02 03 04 05 06 07 08 09 10 11 12);

$count = 0;
foreach $arrayletter (@arrayletterlist) {
    foreach $arraynumber (@arraynumberlist) {
        $masterarray[$count] = $arrayletter . $arraynumber;
        $count++;
    }
}