F x left

F x leftF x leftF x leftF x left
F x leftF x leftF x leftF x leftF x leftF x leftF x leftF x left
F x leftF x leftF x leftF x leftF x leftF x leftF x leftF x leftF x leftF x leftF x leftF x left
F x leftF x leftF x leftF x leftF x leftF x leftF x leftF x leftF x leftF x leftF x leftF x leftF x leftF x leftF x leftF x left
F x leftF x leftF x leftF x leftF x leftF x leftF x leftF x left