The book is coming to an end. In order to give back to the readers for their support and help in the past two years (and far more than two years), I decided to organize a feedback activity at the end and give out some perimeters of the book (specifically to be determined).

Interested friends can join the book friend group (this book has set up a one-click add group function) to participate in voting and lottery.

Must come to Duck!

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