If some of the dogs are howling with their heads pointed up.
return dogs ;return #1 that are howling ;return heads of #2 ;return #2 where  #3 is pointed up ;return number of  #4 ;return number of  #1 ;return if  #5 is at least one ;return difference of #6 and #5 ;return if  #8 is at least one ;return if  both  #7 and #9 are true
['select', 'filter', 'project', 'comparative', 'aggregate', 'aggregate', 'boolean', 'arithmetic', 'boolean', 'boolean']