code: def _check_one_size(self):
          '''
          Checks for single height or single width blocks and flags the occurrence.
  
          Returns:
              True if the block is size 1.
          '''
          block_one = self.end[0] == self.start[0]+1 or self.end[1] == self.start[1]+1
          if block_one:
              self.flag_change(self.flags, 'error', self.start, self.worksheet,
                               message=self.FLAGS['1-size'])
          return block_onf _check_one_size(self):
          '''
          Checks for single height or single width blocks and flags the occurrence.
  
          Returns:
              True if the block is size 1.
          '''
          block_one = self.end[0] == self.start[0]+1 or self.end[1] == self.start[1]+1
          if block_one:
              self.flag_change(self.flags, 'error', self.start, self.worksheet,
                               message=self.FLAGS['1-size'])
          return block_one
docs: Checks for single height or single width blocks and flags the occurrence.
  
          Returns:
              True if the block is size 1.