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But this is a memory version, and there are obvious mistakes, such as the eighth question, which is obviously σ xn divergence.

Because the official did not publish the real question, it can only be a memory version, which is also under the doctor's house. How can I put it? The topic of Nankai has become simpler and simpler in recent years. To be honest, there is no need to do it. It is also possible to sit down in previous years.