The build number of 13.2.3 is 17B111. If they follow recent years that the last build is a G build then doing the math:
13.3 is C
13.4 will be D
13.5 will be E
13.6 will be F
13.7 will be G??
Sometimes they changed the build letter with minor updates, too.
Like 12.1 was 16B92 and 12.1.1 was 16C50 (and 12.1.3 was 16D39!).
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