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@mggger mggger commented Dec 20, 2019

修改之前:

  1. S =lm=> SS* => SS+S* => aS+S* => aa+S* => aa+a*
  2. S =rm=> SS* => Sa* => SS+a* => Sa+a* => aa+a*
![4 2 1](https://f.cloud.github.com/assets/340282/469058/c08b4f9c-b6af-11e2-8236-f79c6a56215a.gif)

修改之后

  1. S =lm=> SS* => SS+S* => aS+S* => aa+S* => aa+a*
  2. S =rm=> SS* => Sa* => SS+a* => Sa+a* => aa+a*
  3. 4 2 1

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