[1e] - t [2r] y-tr [1e] - t [2r] y-tr [1e] - t [2r] y-tr [1e]---- u-u u [2u] y t y [1u]-u-2 i o i [1u]-u-2 y i y [1u]---- [2p]-p p [!p] o i o [2p]-p-1 P s P [2p]-p-! o P o [2p]---- [!u]-u I [2u] y T y [!u]-u-! y u y [@T]-T-2 r T r [!e]---0- T-T - T y Y u e r t T-[@Q]- [2r]-r--T- [2y]--2-0- y-y - y u I [!u] T y u [2y]-r- [!u]-u-2-y- [!T]--!-e- [2p]-p - p O I [!u] y T y u-e- [2I]-I - I y T [@r]--2-0- [!T]-T - T y Y [!u]-e-2 e r t [!T] T t T [2I]-[2u]- [!e]---- u-u u [2u] y t y [1u]-u-2 i o i [1u]-u-2 y i y [1u]---- [2p]-p p [!p] o i o [2p]-p-1 P s P [2p]-p-! o P o [2p]---- [!u]-u I [2u] y T y [!u]-u-! y u y [@T]-T-2 r T r [!e]---0- T-T - T y Y u e r t T-[@Q]- [2r]-r--T- [2y]--2-0- y-y - y u I [!u] T y u [2y]-r- [!u]-u-2-y- [!T]--!-e- [2p]-p - p O I [!u] y T y u-e- [2I]-I - I y T [@r]--2-0- [!T]-T - T y Y [!u]-e-2 e r t [!T] T t T [2I]-[2u]- [1e]