Find the addresses of the course authors who teach the course with name "operating system" or "data structure".
return course authors ;return courses of #1 ;return names of #2 ;return #1 where #2 is operating system ;return #1 where #2 is data structure ;return #4 or  #5 ;return addresses of #6
['select', 'project', 'project', 'comparative', 'comparative', 'union', 'project']