Concept for every iteration 𝑢=𝑓(𝑏)𝑓(𝑐), 𝑣=𝑓(𝑏)𝑓(𝑎), 𝑤=𝑓(𝑎)𝑓(𝑐) 𝑝=𝑣(𝑤(𝑢−𝑤)(𝑐−𝑏−(1−𝑢)(𝑏−𝑎))) 𝑞=(𝑤−1)(𝑢−1)(𝑣−1) then 𝑐=𝑎, 𝑎=𝑏 and 𝑏=𝑏+𝑝