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ZURICH, Nov 20 (Reuters) - The Swiss National Bank made a surprise cut in interest rates on Thursday, slashing 100 basis points off its target range for the 3-month Swiss franc LIBOR to 0.50-1.50 percent. The cut was the third within a month and came as the SNB said there was a higher risk of a marked slowdown in economic activity in Switzerland next year. (Reporting by Emma Thomasson)