What are the last names and ages of the students who are allergic to milk and cat?
return students ;return #1 who  are  allergic to milk ;return #1 who  are  allergic to cat ;return #1 of  both #2 and  #3 ;return last names of  #4 ;return ages of  #4 ;return #5 ,  #6
['select', 'filter', 'filter', 'intersection', 'project', 'project', 'union']