f f f f f f f d-p s---f f f f f f f d-p s---o-p o s-d s f d s o p--p-s p s-d s f-f- d s p o p---- f f f f f f f d-p s---f f f f f f f d-p s---o-p o s-d s f d s o p--p-s p s-d s f-f- d s p o p---- s d- d s d-d s d s p d d - p a-a p a-a p a p I a a - s d-d s d-d s d s p d d---f f f f f f f f f f f f---- f f f f f f f d-p s---f f f f f f f d-p s---o-p o s-d s f d s o p--p-s p s-d s f-f- d s p o p