If at least four phones are stacked on top of each other in at least one of the pictures.
return pictures ;return phones in  #1 ;return #2 that are stacked on top of each other ;return number of  #3 for each  #1 ;return #1 where  #4 is at least four ;return number of  #5 ;return if  #6 is at least one
['select', 'project', 'filter', 'group', 'comparative', 'aggregate', 'boolean']