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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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