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Traders said some of the franc's strength could also be related to positioning before next week's Swiss National Bank policy meeting, at which it is likely to reiterate its commitment to the euro/Swiss peg of 1.20 francs.
The euro fell to 1.22615 francs, its lowest level since early December and down 0.2 percent on the day. Traders said stop-loss sell orders were triggered on the break below 1.2270 francs.