| 1. | The letter after the check character would have a weighting of nine.
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| 2. | The remainder ( modulus 23 ) indicate the check character position in the alphabet.
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| 3. | Since January 2013, the format uses a letter after the current check character.
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| 4. | The letter value would be assigned the same as the check character's.
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| 5. | Every symbol includes two check characters.
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| 6. | Finally, the resulting check code-point is mapped back to obtain its corresponding check character.
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| 7. | The sixth and last character of the CODEN is an alphanumeric check character calculated from the preceding letters.
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| 8. | The check character is calculated using a weighted addition of all the numbers and modulus calculation ( known as Modulus 23 ).
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| 9. | A normal block ending character ( ETB or ETX ) is followed by a check sum ( block check character or BCC ).
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| 10. | To generate the check character, start with the last character in the string and move left doubling every other code-point.
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