What are the first names and last names of the students who are 18 years old and have vice president votes.
return students ;return #1 who are 18 years old ;return #1 who have vice president votes ;return #1 of both #2 and #3 ;return first names  of #4 ;return last names  of #4 ;return #5 ,  #6
['select', 'filter', 'filter', 'intersection', 'project', 'project', 'union']