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The cargoes, loading on May 1-2 and May 8-9, were sold at premiums of 12 and 14 cents a barrel to Dubai quotes, putting the month's average premium at 13 cents, they said.
Chinaoil bought one of the cargoes and the second buyer was not immediately known.
Qatar Petroleum last sold April-loading cargoes at an average premium of 25 cents a barrel to Dubai quotes.