they knew back and that group tossed to .
(ROOT_0 (S_0 (ATS_3 (ATS_4 (S_1 (NP_0 (PRP_1 they)) (VP_5 (VBD_0 knew) (PRT_0 (RP_0 back)))) (CC_0 and)) (S_1 (NP_0 (DT_1 that) (NN_2 group)) (VP_5 (VBD_2 tossed) (S_2 (VP_0 (TO_0 to)))))) (DOT_0 .)))