What is the email of the student with first name "Emma" and last name "Rohan"?
return students ;return first names of  #1 ;return #1 where #2 is  Emma ;return last names of  #1 ;return #1 where #2 is  Rohan ;return #1 of  both #3 and  #5 ;return email of  #6
['select', 'project', 'comparative', 'project', 'comparative', 'intersection', 'project']