f f dfs - s s d d s a s s a p f p o - p-o d---- f f dfs - s s d d s a s s a p f p o - p-o d---- f f dfs - s s d d s a s s a p f p o - p-o d---- f f dfs - s s d d s a s s a p f p o - p-o d - d a o a d g--G-- h--g-f- d - d a o a d h--G - d f-s-d-o- f f dfs - s s d d s a s s a p f p o - p-o d---- f f dfs - s s d d s a s s a p f p o - p-o f---- G-h-G h-G h - G h-- f s f-f G-G h - G h-- G-h-G h-G h - G h-- d s f-f G-G h - G h-- f-f g j - g d - f s a - d-a s f - f f - s s-- f-f g j - g d - f s a - d-a s g - f f - s s-- h-g-f - h f g-f f-- h-g-f - h h g-f d-- d j h G G - G d G-h g f d s f f dfs - s s d d s a s s a p f p o - p-o d---- f f dfs - s s d d s a s s a p f p o - p-o f