sentence1_binary_parse: ( ( The ( arrow heads ) ) ( ( were ( of ( two ( kinds viz ) ) ) ) . ) )
sentence1_parse: (ROOT (S (NP (DT The) (NN arrow) (NNS heads)) (VP (VBD were) (PP (IN of) (NP (CD two) (NNS kinds) (NN viz)))) (. .)))
sentence1: The arrow heads were of two kinds viz.
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.