code: def get_receive(self, script_list):
          
          events = defaultdict(set)
          for script in script_list:
              if self.script_start_type(script) == self.HAT_WHEN_I_RECEIVE:
                  event = script.blocks[0].args[0].lower()
                  events[event].add(script)
          return events
docs: Return a list of received events contained in script_list.