https://zh.m.wikipedia.org/wiki/%E6%B3%A2%E8%8C%A8%E5%9D%A6%E5%85%AC%E5%91%8A
https://zh.m.wikipedia.org/wiki/%E5%B9%B8%E7%81%BD%E6%A8%82%E7%A6%8D
Bal b/f 417 Tempos+9 Tempos=426 Tempos Bal c/f
https://m.youtube.com/shorts/0bnsYdVj1Oc
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