understands characters must come first 
(ROOT (S (VP (VBZ understands) (SBAR (S (NP (NNS characters)) (VP (MD must) (VP (VB come) (ADVP (RB first)))))))))
(ROOT (S (VP (VBZ ) (SBAR (S (NP (NNS )) (VP (MD ) (VP (VB ) (ADVP (RB )))))))))