it was Bolivians stones , that discovered your arm .
(ROOT_0 (S_0 (ATS_3 (ATS_1 (ATS_0 (S_1 (NP_0 (PRP_1 it)) (VP_5 (VBD_1 was) (NP_3 (NNP_1 Bolivians) (NNS_1 stones)))) (COMMA_0 ,)) (NP_0 (DT_1 that))) (VP_3 (VBD_0 discovered) (NP_3 (PRPDOLLAR_0 your) (NN_0 arm)))) (DOT_0 .)))