I guess on lisp classes was Quechua .
(ROOT_0 (S_0 (ATS_3 (NP_1 (PRP_0 I)) (VP_4 (ATVP_1 (VBP_0 guess) (PP_2 (IN_0 on) (NP_3 (NN_0 lisp) (NNS_1 classes)))) (VP_5 (VBD_1 was) (NP_3 (NNP_1 Quechua))))) (DOT_0 .)))