E f t b

E f t bE f t bE f t bE f t bE f t bE f t b
E f t bE f t bE f t bE f t bE f t bE f t b
E f t bE f t bE f t bE f t bE f t bE f t bE f t bE f t bE f t bE f t bE f t bE f t bE f t bE f t bE f t bE f t bE f t bE f t bE f t bE f t bE f t bE f t bE f t bE f t bE f t bE f t bE f t bE f t bE f t b