The pattern strings returned for PDF417 barcodes consist of a stream of digit characters, with alternate characters in each row representing first bars, then spaces. So the pattern 82131 represents an 8 unit bar followed by a 2 unit space, a 1 unit bar, a 3 unit space and a 1 unit bar.
Each row of the barcode symbol is terminated by a newline character (\n or CHR$(10)) in the pattern string.
PDF417 symbols do not contain row separators.
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