and this back cluster , , was silly .
(ROOT_0 (S_0 (ATS_3 (ATS_1 (CC_0 and) (NP_1 (ATNP_2 (NP_6 (ATNP_1 (DT_0 this) (JJ_1 back)) (NN_1 cluster)) (COMMA_0 ,)) (COMMA_0 ,))) (VP_3 (VBD_1 was) (ADJP_0 (JJ_0 silly)))) (DOT_0 .)))