f s a p p f d s a p p-s a p o o d s a p o o-f s a p p f d s a p p-a s d f f-d s p p p- f s a p p f d s a p p-s a p o o d s a p o o-f s a p p f d s a p p-a s d f f-d s p p p- a s d f f g f f g f f d s a s d d f d d f d d s a s d f f g f f g f f d s f - f-d s p p p- a s d f f g f f g f f d s a s d d f d d f d d s a s d f f g f f g f f d s f - f-d s p p p