code: def delete_bigger(self):
          
          logger.info(
              "Deleting all mails strictly bigger than {} bytes...".format(
                  self.smallest_size))
          # Select candidates for deletion.
          candidates = [
              mail for mail in self.pool
              if mail.size > self.smallest_size]
          if len(candidates) == self.size:
              logger.warning(
                  "Skip deletion: all {} mails share the same size."
                  "".format(self.size))
          logger.info(
              "{} candidates found for deletion.".format(len(candidates)))
          for mail in candidates:
              self.delete(mail)
docs: Delete all bigger duplicates.
  
          Only keeps the subset sharing the smallest size.