Why is checkpoint 1.1.5 called base 1 for no apparetn reason, seems like confusing notation (if it is supposed to be a pun)

Hi,

it is called base 1 because the solution to the question reveals the major difference between a base 1 system and a system where b is greater than 1. So the checkpoint is about the base 1 system and that is the reason for the name.

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