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Should describe, in simple language, what the authenticator tried to do, what went
wrong and what the user should try as their "next steps".
TODO: auth_hint belongs in Authenticator but can't be added until the next major
version of Certbot. For now, it lives in .Plugin and auth_handler will only call it
on authenticators that subclass .Plugin. For now, inherit from `.Plugin` to implement
and/or override the method.
:param list failed_achalls: List of one or more failed challenges
(:class:`achallenges.AnnotatedChallenge` subclasses).
:rtype str:
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�ChallengePerformerav Abstract base for challenge performers.
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:param list all_hashes: hashes of every released version of the file
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