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By Janet McBride + f. y( q* {5 Z1 a5 }: p5 | 0 z% @, Z0 y- b2 m' ALONDON (Reuters) - Oil rose towards $70 on Wednesday as U.S. warships put on a show of force off Iran's coast, coinciding with a United Nations agency report that said the Islamic republic had expanded its nuclear programme. " Q* Z0 t; e4 f4 h' @; E, M1 j; r C& N5 \. B9 P3 k `. J