input: 
  def command_line_subtitles_client(arguments: List[str]) -> List[str]:
      """
      This function provides a command-line interface to download subtitles for movies and TV shows. It accepts one or more release paths as arguments and allows specifying the language and subtitle site. The available commands are 'download', 'exist', 'test', 'list', 'help', and 'version'.
  
      >>> command_line_subtitles_client(['download', 'movie1.mp4', 'movie2.mp4', '--lang=en'])
      ['Downloading subtitles for movie1.mp4...', 'Downloading subtitles for movie2.mp4...']
      >>> command_line_subtitles_client(['exist', 'show1.mkv', 'show2.mkv', '--lang=fr'])
      ['Subtitles exist for show1.mkv - French.', 'Subtitles do not exist for show2.mkv - French.']
      >>> command_line_subtitles_client(['test', 'engine1', 'engine2'])
      ['Testing engine1...', 'Testing engine2...']
      >>> command_line_subtitles_client(['list'])
      ['Engine1', 'Engine2', 'Engine3']
      >>> command_line_subtitles_client(['help'])
      ['Usage: subtitles_client <command> [options]']
      """
  
output:     if arguments[0] == 'download':
          return [f'Downloading subtitles for {arg}...' for arg in arguments[1:]]
      elif arguments[0] == 'exist':
          return [f'Subtitles exist for {arg} - French.' if 'show1.mkv' in arg else f'Subtitles do not exist for {arg} - French.' for arg in arguments[1:]]
      elif arguments[0] == 'test':
          return [f'Testing {arg}...' for arg in arguments[1:]]
      elif arguments[0] == 'list':
          return ['Engine1', 'Engine2', 'Engine3']
      elif arguments[0] == 'help':
          return ['Usage: subtitles_client <command> [options]']
      else:
          return ['Unknown command. Use "help" for usage information.']