her discovered That used was n<apostrophe>t the freezing .
(ROOT_0 (S_0 (ATS_3 (NP_1 (PRP_0 her)) (VP_4 (VBD_0 discovered) (SBAR_0 (S_1 (NP_0 (DT_1 That)) (VP_5 (VBD_2 used) (S_2 (VP_0 (ATVP_1 (VBD_1 was) (RB_1 n<apostrophe>t)) (NP_5 (DT_0 the) (NN_2 freezing))))))))) (DOT_0 .)))