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EAN 2
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The EAN-2 is a supplement to the EAN-13 and UPC-A barcodes. It is often used on magazines and periodicals to indicate an issue number.


Encoding
The encoding of EAN-2 characters is very similar to that of the other European Article Numbers. The only difference is that the digits are separated by 01. The EAN-2 always begins with "01011". Also, the R-Code is not used.

+Encoding of the digits
0100111
0110011
0011011
0100001
0011101
0111001
0000101
0010001
0001001
0010111

The structure of the barcode is based on the value of the two digit to be encoded. The two digits treated as a single two-digit number is reduced modulo 4 and used to find the parity pattern to be used. The parity pattern repeats every 4 values.

+EAN-2 Parity
Encode as 0 from L table followed by 0 from L table
Encode as 0 from L table followed by 1 from G table
Encode as 0 from G table followed by 2 from L table
Encode as 0 from G table followed by 3 from G table
Encode as 0 from L table followed by 4 from L table
Encode as 0 from L table followed by 5 from G table
Encode as 0 from G table followed by 6 from L table
Encode as 0 from G table followed by 7 from G table
...
Encode as 9 from G table followed by 8 from L table
Encode as 9 from G table followed by 9 from G table

+Example - encoding 53
0100001

U.P.C. Symbol Specification Manual - Appendix D

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