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(F(x+1) - 2*F(x) + F(x-1)) / dx2.
(2*F(x) - 5*F(x+1) + 4*F(x+2) - F(x+3)) / dx2.
(F(x+1, y+1) - F(x+1, y-1) - F(x-1, y+1) + F(x-1, y-1) / dx*dy.
(2*F(x) - 5*F(x-1) + 4*F(x-2) - F(x-3)) / dx2.
(F(x) + F(x-1)) / 2.
(F(x, y) + F(x-1, y) + F(x, y-1) + F(x-1, y-1)) / 4.
(F(x) - F(x-1)) / dx.
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