(S (S (BASENP (DT The) (JJ current) (NNP Trident) (NN system)) (VP (VP (VP (VBD cost) (NP (QP (SHARP #) (BASENP (NN 12.6) (NN Bn))))) (S (VP (TO to) (VP (VB introduce) (PP (IN at) (BASENP (NN 1996) (NNS prices))))))) (CONJP (COMMA ,) (CC and)) (VP (VP (VBZ requires) (NP (BASENP (QP (SHARP #) (NN 280m))) (BASENP (DT a) (NN year)))) (S (VP (TO to) (VP (VB maintain))))))) (PERIOD .))