Now you the smart human with just gut instincts probably would not be so naive as to start from the left and work your way forward.
但你们都是聪明人,不会傻到,从最左边开始一页一页往后找。
So if you need the help of the notes it's in there but I would urge you to work through it on your own, and it's the following: let's start with the same path A, all right?
如果你需要帮助,可以去看讲义,但我还是希望你们自己去推导它,它是这样的,让我们从:,相同的路径A开始,好吗?
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