code: def readBinaryWatch(self, num):
      """
      :type num: int
      :rtype: List[str]
      """
      return [
          "%d:%02d" % (h, m)
          for h in range(12)
          for m in range(60)
          if (bin(h) + bin(m)).count("1") == num
      ]
  
label_desc: Use image node_id 1 for calling the Solution obj's underlying member method code with example usage: obj.readBinaryWatch(num) and returns: unknown