s-O-s P O- Y-O-s P O- P-s-S-s- P---- s-s-DgDgDgDgs- O-H-g-S- s--P o P o s---- s-O-s P O- Y-O-s P O- P-s-S-s- P---- s-s-DgDgDgDgs- O-H-g-S- s--P o P o s---- D g h H D-D- g-s S s-- O-s- D-H- g-S- P-- P-S s P-P O o O P s s-s- D-H- h-g D d D g h D---- D g h H D-D- g-s S s-- P o P o s-H- g-S- s-- P o P o s-H- g-S- s-- P o P o s