code: def merge_result(res):
      
      if not isinstance(res, dict):
          raise ValueError('Value should be of dict type')
  
      result = set([])
  
      for _, v in res.items():
          for value in v:
              result.add(value)
  
      return list(result)
docs: Merge all items in `res` into a list.
  
      This command is used when sending a command to multiple nodes
      and they result from each node should be merged into a single list.