sentence1_binary_parse: ( It ( ( displays ( ( ( a ( four-headed arrow ) ) ( indicating ( any ( of ( the ( arrow keys ) ) ) ) ) ) ( will ( size ( the window ) ) ) ) ) . ) )
sentence1_parse: (ROOT (S (NP (PRP It)) (VP (VBZ displays) (SBAR (S (NP (NP (DT a) (JJ four-headed) (NN arrow)) (VP (VBG indicating) (NP (NP (DT any)) (PP (IN of) (NP (DT the) (NN arrow) (NNS keys)))))) (VP (MD will) (VP (VBP size) (NP (DT the) (NN window))))))) (. .)))
sentence1: It displays a four-headed arrow indicating any of the arrow keys will size the window.
sentence2_parse: (ROOT (S (NP (JJ Reversible) (NNS reactions)) (VP (VBP are) (VP (VBN indicated) (PP (IN by) (NP (NP (JJ opposite-headed) (NNS kinds)) (PP (IN of) (NP (NNS arrows))))))) (. .)))
sentence2: Reversible reactions are indicated by opposite-headed kinds of arrows.