First of all, I would like to thank the editor for their great support to me, and at the same time, I would like to thank all the book friends, whether they are readers or authors, your comments, rewards, and votes are great encouragement and support for the author.

More than 300,000 words say not much, say a lot less, although not a word pearl, but also condensed a lot of the author's energy, a lot of time, I believe that friends who are also authors must be able to experience the hardships of code words, not much to mention here. I hope that capable friends can support more, do not hesitate to subscribe, even if it is to give the author a little heartfelt comment or advice, the author will be grateful.

Finally, it is necessary for the author to reiterate that since this book has opened a pit, it will definitely try to fill the hole, and unless the author dies suddenly, he will definitely insist on updating it until the book is completed. Because the author can not be full-time code words, there are many other things to do, so this way will be extremely difficult, I hope that all new and old friends can support it, the author firmly believes that you are more wonderful along the way!