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Let f(x,y)f(x, y)f(x,y) return the number of places a knight can move to (in one move) on a standard 8×88\times88×8 chess board from the given (x,y)(x, y)(x,y) position. What is the sum of f(x,y)f(x, y)f(x,y) for all xxx and yyy?
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