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Business P5.25 Postal bar codes. For faster sorting of letters, the United States Postal Service encour ages companies that send large volumes of mail to use a bar code denoting the zip code (see Figure 10). The encoding scheme for a five-digit zip code is shown in Figure 11. There are full-height frame bars on each side. The five encoded digits are followed by a check digit, which is computed as follows: Add up all digits, and choose the check digit to