a waist-high cluster gaze a back smile .
(ROOT_0 (S_0 (ATS_3 (NP_1 (ATNP_1 (DT_0 a) (JJ_1 waist-high)) (NN_0 cluster)) (VP_4 (VBP_0 gaze) (NP_6 (ATNP_1 (DT_0 a) (JJ_1 back)) (NN_1 smile)))) (DOT_0 .)))