o a - s [5s]---- o a - s s---- o a - s s - a s-d- f - d s-a- [4p]---- p S - d d---- p S - d d---- p S - d [7d] - s s-d- f-d-s-a- [5s]---- s s - [6p]---s- [7a]---o- [5a]--s---- s s - [6p]---s- [7a]-p-o-p- [8p]---- s s - [6p]---s- [7a]---o- [5d]--f---- s s - [6p]---i- [7a]-y--t y [5o]