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Reed–Solomon error correction
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===Bar code=== Almost all two-dimensional bar codes such as [[PDF-417]], [[MaxiCode]], [[Datamatrix]], [[QR Code]], [[Aztec Code]] and [[Han Xin code]] use Reed–Solomon error correction to allow correct reading even if a portion of the bar code is damaged. When the bar code scanner cannot recognize a bar code symbol, it will treat it as an erasure. Reed–Solomon coding is less common in one-dimensional bar codes, but is used by the [[PostBar]] symbology.
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