A packet of envelopes <a href=" http://levitrabuycheappurchase.com/levitra-coupon-code.html#bruise ">levitra coupon code </a> LONDON, Oct 1 (Reuters) - Brent crude eased to $108 a barrelon Tuesday, near a seven-week low, on worries that a shutdown ofthe U.S. government will crimp oil demand, while easing tensionsin U.S.-Iran nuclear talks boosted prospects for rising supply.