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Editor's Note: TheStreet ratings do not represent the views of TheStreet's staff or its contributors. Ratings are established by computer based on metrics for performance (which includes growth, stock performance, efficiency and valuation) and risk (volatility and solvency). Companies with poor cash flow or high debt levels tend to earn lower ratings in our model. NEW YORK ( TheStreet) -- Shares of National Bank of Greece (NYSE: NBG) were gapping down Thursday morning with an open price 53.3% lower than Wednesday's closing price. The stock closed at $12.20 Wednesday and opened today's trading at $5.70.