A letter to book friends in the New Year

I wish you all a Happy New Year!

  Thank you for your company this year. This book has been written since the end of the year, and the current results are due to your support!

  Thanks to new and old book friends for their perseverance.

thank you very much.

   I wish you all a happy new year, good luck in everything, success in everything, and good health!

  (end of this chapter)