old_contents: crontable = []
  outputs = []
  
  
  def process_message(data):
      if data['channel'].startswith("D"):  # DM channel
          outputs.append([data['channel'], data['text']])
      else:
          outputs.append([data['channel'], '난 DM 에만 메아리친다. :D'])
  
  
new_contents: crontable = []
  outputs = []
  
  
  def process_message(data):
      if data['channel'].startswith('D'):  # DM channel
          if 'text' in data and data['text'].startswith('echo'):
              outputs.append([data['channel'], data['text']])
  
  
subject: 수정된 메세지에는 대응하지 않음.