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  1. or download this
    my $pinc = join('', $data1, $data2, $data3);
    my $pin = sprintf('%04d', unpack('N', md5($pinc)) % 10000);
    
  2. or download this
    my $pinc = join('', $data1, $data2, $data3);
    my $pin = sprintf('%04d', unpack('%32C*', $pinc) % 10000);