Pinfu history
http://www.mahjongnews.com/en/news/trivia/3431-getting-something-for-nothing
Chairman Mao
- http://www.zgdsw.com/newsx.asp?id=405 KyuuAA (Talk:キュウ) 09:20, 21 August 2020 (UTC)
http://www.mahjongnews.com/en/news/trivia/3431-getting-something-for-nothing