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The average yield on 91-day treasury bills slipped to 13.963 percent from 14.008 percent at last week's auction, while that on 273-day T-bills declined to 14.669 percent from 14.693 percent, the central bank said.
The bank said it had sold 2.44 billion pounds' ($349 million) worth of the 91-day T-bills and 3 billion pounds of the 273-day bills.