'(= (Counterweight_Bottom_Reference ?X)
(+ (* 0.1 (Hoistway_Travel ?X))
(+ 6
(- (Hoistway_Pit_Depth ?X)
(+ (Counterweight_Buffer_Footing_Channel_Height ?X)
(+ (Counterweight_Buffer_Blocking_Height ?X)
(Counterweight_Buffer_Height ?X)))))))