What is the first name of the student whose last name starting with the letter S and is taking ACCT-211 class?
return students ;return last names of  #1 ;return #1 where #2 start with the  letter S ;return classes of  #1 ;return #1 where #4 is  ACCT-211 ;return #1 of  both #3 and  #5 ;return first name  of  #6
['select', 'project', 'comparative', 'project', 'comparative', 'intersection', 'project']