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-- Oil rallied above $82 a barrel as sharp price hikes from Saudi Arabia offered the latest signal that stockpiles globally are declining sharply and firing prices higher.West Texas Intermediate rose 1.4% and is up almost 5% over the last two trading sessions. Saudi Arabia made some of the biggest increases to its official selling prices in decades late-last week, a move enabled by low global stockpiles and tight supplies, according to Vitol Group. In a further sign of robust demand, Asian buye