[(Y]-s-P-O- [(Y]---Y Y [(Y]-s-P-O- [qi]---- [qi]-S-s-P- [wo]---- [wD]-D-S-P- [Ws]---- [(Y]-s-P-O- [(Y]---- [(Y]-s-P-O- [qi]---i- [qi]-S-s-P- [(D]-D-D-D- [(g]-D-S-P- [WO]--[YD]-- [Ws]-s-s-- [Ws]-s-s-- [Ws]-D-[WO] - P [Ws]---- [WS]-S-S - S [WS]-s-s-s s [ws]-P-P-s- [wP]--D-- [Ws]-s-s-- [Ws]-s-s-- [Ws]-D-[WO] - P [Ws]---- [WS]-S-S - S [WS]-s-s-s s [wD]-D-S-P- [WO]