next1 next0 next2 next0 next1 next0 next2 next0 next1 next0 next2 next0 next1 next0 next2 next0 y0 next2 next0 next1 next0 next2 next0 next1 next0 next1 next0 next2 next0 next1 next0 next2 next0 next1 next0 next1 next0 next2 next0 next1 next0 next2 next0 next1 next0 next1 next0 next2 next0