Each symbol is formed from a series of one or more data character pairs. Each pair is coded into a series of five bars and five spaces with the bars representing the more significant digit of the pair while the white spaces represent the less significant digit. Should a number containing an odd number need to be encoded, a leading zero must be added. Special start and stop patterns are necessary to identify the leading and trailing ends of the barcode symbol.
Quiet zones are spaces preceding the start pattern and following the stop pattern.
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