that dropped under mounds , or He piled ?
(ROOT_0 (S_0 (ATS_3 (ATS_4 (ATS_0 (S_1 (NP_0 (DT_1 that)) (VP_5 (VBD_2 dropped) (PP_2 (IN_0 under) (NP_3 (NNS_1 mounds))))) (COMMA_0 ,)) (CC_0 or)) (S_1 (NP_1 (PRP_0 He)) (VP_5 (VBD_1 piled)))) (DOT_0 ?)))