If there are three zebras and one of them is a juvenile.
return zebras ;return #1 that are juveniles ;return number of  #1 ;return number of  #2 ;return if  #3 is equal to  three ;return if  #4 is equal to  one ;return if  both  #5 and #6 are true
['select', 'filter', 'aggregate', 'aggregate', 'boolean', 'boolean', 'boolean']