[6s]-a-s-a- [6s]-o-s-i---- t u [6s]-a-s-a- [6s]-o-s-i---- t u [6s]-a s - a s 6-o s - i- [5u]-i-o-u- [5y]---t r [6t]---t y [6u]---u i [5o]--o-i u [5y]--s d s a [6s]-o-s d s a [6s]-o-s d s a [5s] d f g h f d s [5a]--s d s a [6s]-o-s d s a [6s]-o-s d s a [5s] d f g h f d s [5a]---- [6s]-a-s-a- [6s]-o-s-i---- t u [6s]-a-s-a- [6s]-o-s-i