The number of a 5 Euro banknote starts with a land code of twoletters, followed by 10 digits. For example, the land code UEstands for France. If we replace the letters of the alphabet bytheir two-digit positions in the alphabet (e.g. UE is replaced by21 05), we find a number of in total 14 digits. It appears that theobtained number always equals 7 (mod 9). Is this code 1-errorcorrecting? If so, why? If not, give an example of a number of abank note that has one error in it that cannot be corrected.
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