code: def compare(dicts):
      
  
      common_members = {}
      common_keys = reduce(lambda x, y: x & y, map(dict.keys, dicts))
      for k in common_keys:
          common_members[k] = list(
              reduce(lambda x, y: x & y, [set(d[k]) for d in dicts]))
  
      return common_members
docs: Compare by iteration