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MARKETS: SPYing a falling knife

Stocks slice through support levels on their fourth straight day of declines. Where do traders buy the dip? Yahoo Finance's Jared Blikre and Myles Udland break down the technicals, including Anchored VWAP, in the SPDR S&P 500 ETF (SPY). Also explored are the Philadelphia Semiconductor Index and the iShares Expanded Tech-Software ETF (IGV).