Find the start and end dates of detentions of teachers with last name "Schultz".
return teachers ;return last names of  #1 ;return #1 where  #2 is  Schultz ;return detentions of  #3 ;return start dates of  #4 ;return end dates of  #4 ;return #5 ,   #6
['select', 'project', 'comparative', 'project', 'project', 'project', 'union']