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上下文有关文法的例子
aaa bbb ccc 的产生链是：SaRcaaRTcaaaRTTcaaabTTcaaabbUTcaaabbUUcaaabbVUcaaabbVccaaabbbcccaaaa bbbb cccc 的产生链是：SaRcaaRTcaaaRTTcaaaaRTTTcaaaabTTTcaaaabbUTTcaaaabbUUTcaaaabbUUUcaaaabbUVUcaaaabbUVccaaaabbVVccaaaabbbWVccaaaabbbWWccaaaabbbTWccaaaabbbTcccaaaabbbbcccc ...
