单词：precedence grammar
precedence grammar的用法和样例：
例句
- The new grammar is unambiguous and an efficient parsing algorithm is also given.不包含单项产生式的运算符优先文法也是它的真子文法。
- Therefore the class of generalized precedence grammar is a superclass of the weak precedence grammar.弱优先文法和弱运算符优先文法都是它的真子文法。
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