If there are at least  five  zebras and five cows grazing.
return zebras ;return cows ;return #1 that are grazing ;return #2 that are grazing ;return number of  #3 ;return number of  #4 ;return if  #5 is at least five  ;return if  #6 is at least five  ;return if  both  #7 and #8 are true
['select', 'select', 'filter', 'filter', 'aggregate', 'aggregate', 'boolean', 'boolean', 'boolean']