code: def isInvalid(self, time, city, transactions_by_name):
      for current_time, current_city in transactions_by_name:
          if city != current_city and time in range(
              current_time - 60, current_time + 61
          ):
              return True
      return False
  
label_desc: Use image node_id 2 for calling the Solution obj's underlying member method code with example usage: obj.isInvalid(time, city, transactions_by_name) and returns: False, True