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OCR: F(k)+Q F2(k) for OSks ( - 1 ) F(X)= F(k-)-OFF;(k- for -SkS(N-1) 2 (-2tk)+ isin( N ) (-2nk) { -2zk Example 3: F(k) can be written as a combination of two N/2-point DFTs, F;(k) and F (k), holding the even and odd samples of F(k), respectively.