text1: they might be but not at not at the human factors level
feat_premise_binary_parse: ( they ( might ( be ( ( but ( ( not ( at not ) ) ( at ( the ( human factors ) ) ) ) ) level ) ) ) )
feat_premise_parse: (ROOT (S (NP (PRP they)) (VP (MD might) (VP (VB be) (ADJP (PRN (CC but) (ADVP (RB not) (IN at) (RB not)) (PP (IN at) (NP (DT the) (JJ human) (NNS factors)))) (JJ level))))))
text2: They're not at the human factors level. 
feat_hypothesis_binary_parse: ( They ( ( ( 're not ) ( at ( the ( human ( factors level ) ) ) ) ) . ) )
feat_hypothesis_parse: (ROOT (S (NP (PRP They)) (VP (VBP 're) (RB not) (PP (IN at) (NP (DT the) (JJ human) (NNS factors) (NN level)))) (. .)))