Why doesn't Bech32 use the character "b" in the data part?

The data part of a Bech32 address uses alphanumeric characters excluding "1", "b", "i", and "o".

I understand that "1", "i", and "o" are excluded as they could be mistaken for other similar-looking characters, and another character needs to be removed to get down to a base 32 character set, but why "b"?

Out of all the remaining characters that could be removed, it seems like "l" (lowercase "L") might have been the next choice.

Is there a specific reason why "b" was excluded instead?



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