CF-xxx vs. C-Fxxx

On 2005-10-06, Steven P. McNicoll wrote:
When are letters numbers?

Generally in any base base 10. Base 36 for instance uses the digits 0
to Z - so every letter of the alphabet is a number.

Hex is very common (0-F), but we do have one system that uses base 36.
Base 64 encoding is also common (in which case 'a' is a different number
to 'A')

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