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254 Chapter 5 Methods .. Business Ps.22 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 7) The encoding scheme for a five-digit zip code is shown in Figure 8. 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 make the sum a multiple of 10. For example, the zip code 95014 has a sum of 19, so the check digit is 1 to make the sum equal to 20. ECRLOTCO57 CODE C671RTS2 JOHN DOE 1009 FRANKLIN BLVD SUNNYVALE CA 95014-5143 CO57 Frame bars Digit 1 Digit 2 Digit 3 Digit 4 Digit s Check Digit Figure 7 A Postal Bar Code Figure 8 Encoding for Five-Digit Bar Codes Each digit of the zip code, and the check digit, is encoded according to the table below, where 1 denotes a full bar and O a half bar Bar1 (weight 7) Bar 2 (weight 4) Bar 3 (weight 2) Bar 4 (weight 1) Bar 5 (weight 0)