(S (S (S (NP (BASENP (DT A) (NN borehole)) (PP (IN beneath) (BASENP (NNP Buckingham) (NNP Palace)))) (VP (VP (VBZ provides) (BASENP (JJ cold) (NN water))) (PP (IN for) (BASENP (NN air-conditioning))))) (CC and) (S (NP (NP (NP (BASENP (DT the) (NNP Duke)) (PP (IN of) (BASENP (NNP Edinburgh)))) (POS 's)) (NN taxi)) (VP (VBZ runs) (PP (IN on) (BASENP (JJ liquid) (NN petroleum) (NN gas)))))) (PERIOD .))