Good Grief!
Ya'll proved my point above. Nobody knows and nobody cares.
For the LAST time! Don't waste your time on the easy combinations because I checked them all a long time ago:
A-Z
AA-ZZ
AAA-ZZZ
AAAA-ZZZZ
AAAAA-ZZZZZ
AAAAAA-ZZZZZZ
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Gold Squadron. The brightest star of the Rebellion Fleet!