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							- from services.errors.base import BaseServiceError
 - 
 - 
 - class FirstMessageNotExistsError(BaseServiceError):
 -     pass
 - 
 - 
 - class LastMessageNotExistsError(BaseServiceError):
 -     pass
 - 
 - 
 - class MessageNotExistsError(BaseServiceError):
 -     pass
 - 
 - 
 - class SuggestedQuestionsAfterAnswerDisabledError(BaseServiceError):
 -     pass
 
 
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