o--s-o- p--I o p- [wo]--[9a]-[*P]- [8p]--[9y] r r r [3r]---r r r [2r]---r r r [3r]--4 r [4r] r [3r]--2 r r r [3r]---r r r [2r]---r r r [3r]--4 r [4r] r [3r]--2-- 3 r r r r r r r [2e] e e e y - y [3u] r-e 4 r 4 r 3 e r e 2 w w- 3 r r r r - r [2e] e e e y - y [3u] r-e 4 r 4 r 3 e r e 2 - e [3u]-y-r-e w [2e] w r-r - r [3u] u y y [4r] r [4e] w [3e] r y r 2 - w [3u] u y y r r e w [2u] u y y r - r [1r] r r r [2r] r r r [3r] r-r [2y]-u- 3-o-u o-u [2o] u o-u - y [3o] o o o [4u] u [4u] y [3y] u u-2-- 3-o-u o-u [$o] u p-o - T [7Y] Y Y Y Y-u I--- r r r [3y]-y t y r r r [2y]-y t y r r r [3y]-y t [4y] r [4r] r [3y]-y t [2y] t - [3y]-y t y r r r [2y]-y t y r r r [3y]-y t [4y] r [4r] r [3y]-y t [2y] t - [3o]-y t a-o- [2p]-y t I o p- [3o]-y t [4a]-[4P]- [3p]-y t [2y] t--- {1a}