[7p]---- [3d]---- [4o]---- [3d]---- [7d]---- [3f]---- [4g]---- [3f]---- [7d]---- [3s]---- [4d]---- 3---- [7I] S a I i O P- [3P] S-s-a-p 4-O--I S [3a] I i O P-P S 7 s-a-p - [3O] I S a I i O P 4 P S-s-a- [3p] - O