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(ROOT_0 (S_0 (ATS_3 (NP_1 (DT_1 this) (NNS_0 knees)) (VP_4 (VBN_0 been) (S_2 (VP_0 (ATVP_1 (MD_0 might) (ADVP_0 (RB_0 downright))) (VP_1 (VB_0 think) (NP_3 (NP_5 (DT_0 an) (NN_2 thunder)) (PP_0 (IN_1 by) (NP_2 (NN_3 inside) (RB_1 n<apostrophe>t))))))))) (DOT_0 .)))