text1:  He grimaced at his own doubts.
feat_premise_binary_parse: ( He ( ( grimaced ( at ( his ( own doubts ) ) ) ) . ) )
feat_premise_parse: (ROOT (S (NP (PRP He)) (VP (VBD grimaced) (PP (IN at) (NP (PRP$ his) (JJ own) (NNS doubts)))) (. .)))
text2: He grimaced at his doubts. 
feat_hypothesis_binary_parse: ( He ( ( grimaced ( at ( his doubts ) ) ) . ) )
feat_hypothesis_parse: (ROOT (S (NP (PRP He)) (VP (VBD grimaced) (PP (IN at) (NP (PRP$ his) (NNS doubts)))) (. .)))