f S x' S x h g x' S x f S S x' x h 0 S x h 0 x h 0 0 0 g S x S x' h f S x S x' g x S S x' g S x 0 0 f S x 0 0 h S x x2 h x x2 g 0 x2 0 f 0 x2 0 f 2 S 1 h 2 g 2 0 0 INNERMOST