Find the name of the person who has no student friends.
return people ;return friends of #1 ;return #2 who are students ;return number of  #3 for each #1 ;return #1 where #4 is  at least one ;return #1 besides #5 ;return the  name of #6
['select', 'project', 'filter', 'group', 'comparative', 'discard', 'project']