If a total of three puppies are shown, most of them sitting.
return puppies ;return #1 that are  sitting ;return number of #1 ;return number of #2 ;return if  #3 is  equal to three ;return if  #4 is  equal to two ;return if  both  #5 and #6 are  true
['select', 'filter', 'aggregate', 'aggregate', 'boolean', 'boolean', 'boolean']