プロダクションルール(生成規則)

Production rule

https://gyazo.com/e91a3c789dcc691826087e472eb965ff

https://gyazo.com/bf85b301037b93b4bfe8ba0d17ce3f72

https://gyazo.com/afc5c7f483836cc0068103e7842b0851

https://gyazo.com/7fb4ae7405239f05d05255a3d0d77580

https://gyazo.com/7048f2c7dd344539e252f52580659b8c