'(= (Car_Buffer_Blocking_Height ?X)
(Floor (- (Hoistway_Pit_Depth ?X)
(+ 6
(+ (Platform_Height (Elevator.Platform ?X))
(+ (Safety_Beam_Height (Elevator.Safety ?X))
(+ (Car_Buffer_Height (Elevator.Carbuffer ?X))
(Car_Buffer_Footing_Channel_Height
(Elevator.Carbuffer ?X)))))))))