If at least one hound has a red collar around its neck.
return hounds ;return collar of #1 ;return neck of #1 ;return #2 that is around #3 ;return #4 that is red ;return #1 that has #5 ;return number of  #6 ;return if  #7 is at least one
['select', 'project', 'project', 'filter', 'filter', 'filter', 'aggregate', 'boolean']