0 w [6e]-e-e r [4t]-t-t y [3r]-r-e w [6w] e - 0 w [4e]-e-e r [1t]-t-t y [5r]-r-e w [6e]--0 w [6e]-e-e t [4y]-y-y u [2i]-i-u y [6u] e - e r [4t]-t-y- [6u] e - e t [3r]-r-t e [3r]--0 w [6e]-e-e r [4t]-t-t y [3r]-r-e w [6w] e - 0 w [4e]-e-e r [1t]-t-t y [5r]-r-e w [6e]--0 w [6e]-e-e t [4y]-y-y u [2i]-i-u y [6u] e - e r [4t]-t-y- [6u] e - e t [3r]-r-t e [3r]--0 w [3r]-r-e w [6e]