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I think you should be able to choose the first six and fill in the blanks with the first four. Take a good look at sets, complex numbers, probabilities, polar coordinates and equations, vectors and algorithms ... these are all very simple in the choice of fill-in-the-blank questions, and the basic calculation comes out in one step. Then you can do the triangle, probability, geometry and derivative of the big problem. Just look at the double angle formula in the triangle. Geometric coordinate system, the probability is too simple. Derivation. Just like playing on 100.