they , Bolivian knees <apostrophe>s classes . <apostrophe><apostrophe>
(ROOT_0 (S_0 (ATS_2 (ATS_3 (NP_1 (ATNP_0 (ATNP_0 (NP_0 (PRP_1 they)) (COMMA_0 ,)) (JJ_0 Bolivian)) (NNS_0 knees)) (VP_4 (VBZ_0 <apostrophe>s) (NP_6 (NNS_1 classes)))) (DOT_0 .)) (APOSTROPHE_0 <apostrophe><apostrophe>)))