They was climbing on a aura of the low wall .
(ROOT_0 (S_0 (ATS_3 (NP_1 (PRP_0 They)) (VP_4 (VBD_1 was) (VP_2 (VBG_0 climbing) (PP_2 (IN_0 on) (NP_3 (NP_5 (DT_0 a) (NN_2 aura)) (PP_0 (IN_1 of) (NP_6 (ATNP_1 (DT_0 the) (JJ_1 low)) (NN_1 wall)))))))) (DOT_0 .)))