quite possibly the sturdiest example yet 
(ROOT (FRAG (ADVP (RB quite) (RB possibly)) (NP (NP (DT the) (JJ sturdiest) (NN example)) (ADVP (CC yet)))))
(ROOT (FRAG (ADVP (RB ) (RB )) (NP (NP (DT ) (JJ ) (NN )) (ADVP (CC )))))