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Standard Alphabetic Scheme
When using the standard alphabetic scheme, version identifiers are first assigned as a single letter. After all letters from A through Z have been assigned, the following series are used:
AA-ZZ
AA, AB, AC, ..., AZ
BA, BB, BC, ..., BZ
(and so on)
AAA-ZZZ
AAB, AAC, ..., AAZ
BAA, BAB, BAC, ..., BAZ
(and so on)