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-- Oil edged higher after eking out a modest weekly gain as investors assessed the outlook for demand amid a resurgence in Covid-19.Futures in New York traded above $72 a barrel after adding 0.4% last week, the first weekly advance in three. There are signs that demand for fuels such as gasoline has increased as vaccination programs are rolled out, although the fast-spreading delta variant has raised concerns about the short-term outlook. Tight restrictions have been renewed including curfews i