If there are at least eight vultures eating a dead animal who is horns are visible.
return vultures ;return animal ;return #2 that is dead ;return horns of #3 ;return #3 where  #4 are visible ;return #1 eating #5 ;return number of  #6 ;return if  #7 is at least eight
['select', 'select', 'filter', 'project', 'comparative', 'filter', 'aggregate', 'boolean']