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| | Anatomy of Credit Card Numbers |
 | | If the MII digit is 9, then the next three digits of the issuer identifier are the 3-digit country codes defined in ISO 3166, and the remaining final two digits of the issuer identifier can be defined by the national standards body of the specified country in whatever way it wishes. |
 | | By changing the check digit from 0 to 3, we arrive at the number 4408 0412 3456 7893, which does pass the Luhn check, since the sum of the digits in the bottom row would be 70, which is divisible by 10. |
 | | By changing the check digit from 2 to 3, we arrive at the number 4417 1234 5678 9113, which does pass the Luhn check, since the sum of the digits in the bottom row would be 70, which is divisible by 10. |
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