> "abc"
> "b"->"c"
> "cc"->"zz"
> 
> 答案是 2 还是 3 ?

我想应该是２吧．(我还没有AC)
The language defined by this grammar is the set of all strings that can
 be generated by repeatedly replacing s1 by s2 within the initial string. 
cc不是within　the initial string.

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