input: 
  def can_create_html_table_of_contents(data_source: str) -> str:
      """ Determines if it is possible to create a HTML page that displays a table of contents,
      given a data source like a database. 
  
      >>> can_create_html_table_of_contents('database')
      'Yes, it is possible to create a HTML page that displays a table of contents from the data stored in a database.'
      """
  
output:     if data_source == 'database':
          return 'Yes, it is possible to create a HTML page that displays a table of contents from the data stored in a database.'
      else:
          return 'No, it is not possible to create a HTML page that displays a table of contents from the given data source.'