If one of the laptops is turned so the screen is visible, and the other is turned so that the screen is not visible.
return laptops ;return screen of #1 ;return #1 that is   turned  so  #2 is visible ;return number of  #3 ;return if  #4 is   equal to  one ;return #1 besides  #3 ;return number of  #6 ;return if  #7 is   equal to  one ;return if  both  #5 and #8 are true
['select', 'project', 'filter', 'aggregate', 'boolean', 'discard', 'aggregate', 'boolean', 'boolean']