'(= (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)))))))))