(S (S (NP (NP (DT The) (NP (QT (DQL ``) (BASENP (JJ big) (NN six)) (DQR '')) (BASENP (NN energy) (NNS companies)))) (PP (IN in) (BASENP (DT the) (NNP United) (NNP Kingdom)))) (VP (VBP are) (NP (NP (NP (NP (NP (BASENP (NNP British) (NNP Gas)) (COMMA ,) (BASENP (NNP E-on))) (COMMA ,) (BASENP (NNP Npower))) (COMMA ,) (BASENP (ADJP (NNP Scottish) (CC and) (NNP Southern)) (NNP Energy))) (COMMA ,) (BASENP (NNP Scottish) (NNP Power))) (CONJP (COMMA ,) (CC and)) (BASENP (NNP EDF) (NNP Energy))))) (PERIOD .))