List the first and last name of the students who do not have any food type allergy.
return students ;return allergies of  #1 ;return types of  #2 ;return #1 where  #3 is not  food ;return first names of  #4 ;return last names of  #4 ;return #5 ,  #6
['select', 'project', 'project', 'comparative', 'project', 'project', 'union']