and They had overlooking through a classes .
(ROOT_0 (S_0 (ATS_3 (ATS_1 (CC_0 and) (NP_1 (PRP_0 They))) (VP_3 (VBD_1 had) (VP_2 (VBG_0 overlooking) (PP_2 (IN_0 through) (NP_6 (DT_0 a) (NNS_1 classes)))))) (DOT_0 .)))