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这里是制作。
A-> Aa| b|c;
现在我应该做
A->bA' A'-> aA' | e (empty transition) A->c
会是正确的答案吗?那是'b'或'c'都可以用吗?
我想说,开头必须有'b'或'c',所以更像这样:
A -> bA' | cA' A'-> aA' | e