about the seven-hour sun on regional structures , <apostrophe><apostrophe>
(ROOT_0 (S_0 (ATS_2 (PP_2 (IN_0 about) (NP_3 (NP_6 (ATNP_1 (DT_0 the) (JJ_1 seven-hour)) (NN_1 sun)) (PP_0 (IN_1 on) (NP_2 (JJ_1 regional) (NNS_1 structures))))) (COMMA_0 ,)) (APOSTROPHE_0 <apostrophe><apostrophe>)))