How many students are over 18 and do not have allergy to food type or animal type?
return students ;return #1 that are over 18 ;return type of allergies of  #2 ;return #2 where #3 is food type ;return #2 where #3 is animal type ;return #2 besides  #4 ,  #5 ;return number of  #6
['select', 'filter', 'project', 'comparative', 'comparative', 'filter', 'aggregate']