though he only scratches the surface , at least he provides a strong itch to explore more . 
(ROOT (S (SBAR (IN though) (S (NP (PRP he)) (ADVP (RB only)) (VP (VBZ scratches) (NP (DT the) (NN surface))))) (, ,) (ADVP (IN at) (JJS least)) (NP (PRP he)) (VP (VBZ provides) (NP (DT a) (JJ strong) (NN itch) (S (VP (TO to) (VP (VB explore) (NP (JJR more))))))) (. .)))
(ROOT (S (SBAR (IN ) (S (NP (PRP )) (ADVP (RB )) (VP (VBZ ) (NP (DT ) (NN ))))) (, ) (ADVP (IN ) (JJS )) (NP (PRP )) (VP (VBZ ) (NP (DT ) (JJ ) (NN ) (S (VP (TO ) (VP (VB ) (NP (JJR ))))))) (. )))