Show first name, last name, age for all female students. Their sex is F.
return students ;return sex of #1 ;return #1 where #2 is F ;return first names of #3 ;return last names of #3 ;return ages of #3 ;return #4 ,  #5 ,   #6
['select', 'project', 'comparative', 'project', 'project', 'project', 'union']