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By Janet McBride; z2 d5 N: b r7 l1 F6 h4 j
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LONDON (Reuters) - Oil rose towards $70 on Wednesday as U.S. warships put on a show of force off Iran's coast, coinciding with a United Nations agency report that said the Islamic republic had expanded its nuclear programme.4 I+ l2 g$ z k5 c0 V. X; P