If one of the stairways curves, while the other stairway has straight sections.
return stairways ;return #1 that have  curve sections ;return #1 that have  straight sections ;return number of #2 ;return number of #3 ;return if  #4 is  equal to one ;return if  #5 is  equal to one ;return if  both  #6 and #7 are  true
['select', 'filter', 'filter', 'aggregate', 'aggregate', 'boolean', 'boolean', 'boolean']