If there are two saucers in total, each holding a coffee cup.
return saucers ;return coffee cup ;return #1 holding #2 ;return number of  #1 ;return number of  #3 ;return if  #4 is equal to  two ;return if  #5 is equal to  two ;return if  both  #6 and #7 are true
['select', 'select', 'filter', 'aggregate', 'aggregate', 'boolean', 'boolean', 'boolean']