Show all the locations where no cinema has capacity over 800.
return locations ;return cinemas in #1 ;return capacities of #2 ;return #2 where #3 is  over 800 ;return number of  #4 for each #1 ;return #1 where #5 is  at least one ;return #1 besides #6
['select', 'project', 'project', 'comparative', 'group', 'comparative', 'discard']