If there are two rolled towels one blue and one pink.
return towels ;return #1 that are rolled ;return #2 that are blue ;return #2 that are pink ;return number of  #3 ;return number of  #4 ;return if  #5 is equal to  one ;return if  #6 is equal to  one ;return if  both  #7 and #8 are true
['select', 'filter', 'filter', 'filter', 'aggregate', 'aggregate', 'boolean', 'boolean', 'boolean']