If there are two packages of paper towels and one single paper towel roll.
return paper  towels ;return packages of #1 ;return roll of #1 ;return number of  #2 ;return if  #4 is equal to  two ;return number of  #3 ;return if  #6 is equal to  one ;return if  both  #5 and #7 are true
['select', 'project', 'project', 'aggregate', 'boolean', 'aggregate', 'boolean', 'boolean']