stuff single , parents much studied and was up to try boulders .
(ROOT_0 (S_0 (ATS_3 (NP_1 (ATNP_0 (NP_6 (NN_3 stuff) (JJ_0 single)) (COMMA_0 ,)) (NNS_0 parents)) (VP_4 (ATVP_1 (VP_5 (ADVP_0 (RB_0 much)) (VBN_0 studied)) (CC_0 and)) (VP_5 (ATVP_3 (VBD_2 was) (PRT_0 (RP_0 up))) (S_2 (VP_0 (TO_0 to) (VP_1 (VB_0 try) (NP_3 (NNS_1 boulders)))))))) (DOT_0 .)))