a kind looked back tried to air .
(ROOT_0 (S_0 (ATS_3 (NP_1 (DT_1 a) (NN_2 kind)) (VP_4 (ATVP_1 (VBD_1 looked) (ADVP_0 (RB_0 back))) (VP_5 (VBD_2 tried) (S_2 (VP_0 (TO_0 to) (VP_1 (NP_2 (NN_3 air)))))))) (DOT_0 .)))