The book is over.

To sum up, it's not so much that the results are not ideal, but that I am dissatisfied with my level.

In the middle, because of the operation, it was broken for a few days, which disappointed the people who trusted me.

There are still many holes in this book that have not been buried, and there are stories that have not been told, but it doesn't matter, I will write these in the form of extras one after another, and update them from time to time to read to book friends who have always supported me.

At the same time, the end of this book does not mean that my work is over.

I will also revise the typos and sick sentences in the book one after another, after all, this is my bottom line in the world.

Finally, thank you again for always supporting my book friends, and I hope you will continue to do so in the years to come.

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