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By Swati Verma BENGALURU (Reuters) -Oil prices rose to a more than seven-year peak on Friday and recorded their sixth straight weekly gain as geopolitical turmoil exacerbated concerns over tight energy supply. On a weekly basis, the benchmark contracts notched their longest run of gains since October. Brent futures rose 69 cents to settle at $90.03 a barrel, after hitting $91.70, the highest level since October 2014. U.S. crude closed 21 cents higher at $86.82 per barrel, after hitting a seven-year peak of $88.84 during the session. Tight oil supplies pushed the six-month market structure for …