(S (S (S (S (BASENP (NNP NYMEX) (NNP Crude)) (VP (VBD closed) (PP (IN at) (BASENP (DOLLAR $) (NN 91.86))))) (COMMA ,) (SBAR (IN while) (S (BASENP (NNP ICE) (NNP Brent)) (VP (VBD closed) (PP (IN at) (BASENP (DOLLAR $) (NN 88.69))))))) (COMMA ,) (PP (IN at) (NP (BASENP (DT the) (NN conclusion)) (PP (IN of) (NP (BASENP (NNP Friday) (POS 's)) (NN trading)))))) (PERIOD .))