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* FTSE 100 closes down 0.3 pct at 6,449.27 points The blue-chip FTSE 100 index closed down by 0.3 percent, or 16.39 points, at 6,449.27 points – its lowest close since ending at 6,439.96 points on Dec. 13. ARM fell 5.9 percent in heavy volume to make it the worst-performing FTSE stock in percentage terms, after it posted a smaller-than-expected rise in royalty revenues. Trading volumes in ARM …