w-y-y-t r t r e-e-w e r-e r t-r w r-e--- w-y-y-t r t r e-e-w e r-e r t-r w y---- [8t]-o-o-i u [8i] u y-y-t y [8u]-y u i-u t [8u]-y--- [8t]-o-o-i u [8i] u y-y-t y [8u]-y u i-u y [wy]-[8t]