6- f---5- d---4- s---3- a---[6f]---- [5d]---- [3a]---- [6p]- s-f-s-[6p]- s-f-s-[5o]- a-d-a-[5o]- a-d-a-[4i]- p-s-p-[4i]- p-s-p-[3u]- O-a-O-[3u]- O-a-O-[6p]- s-f-d s [5o]- a-d-s a [4i]- p-s-a p [3u]- O-a-p O [6f]---- [5d]---- [4s]---- [3a]---- 6- f-5-d-4- s-3-a-[6p] s f s [5o] a d a [4i] p s p [3u] O a O [6f]---- [5d]---- [4s]---- [3a]