'(= (Counterweight_Runby ?X)
(- (Counterweight_Bottom_Reference ?X)
(- (Hoistway_Pit_Depth ?X)
(+ (Counterweight_Buffer_Footing_Channel_Height ?X)
(+ (Counterweight_Buffer_Blocking_Height ?X)
(Counterweight_Buffer_Height
(Elevator.Counterwtbuffer ?X)))))))