it slid who It stepping puffy .
(ROOT_0 (S_0 (ATS_3 (NP_1 (PRP_1 it)) (VP_4 (VBD_0 slid) (SBAR_0 (WHNP_0 (WP_0 who)) (S_2 (NP_1 (PRP_0 It)) (VP_2 (VBG_0 stepping) (ADVP_0 (RB_0 puffy))))))) (DOT_0 .)))