Note also the use of left recursion.
还要注意向左递归的使用。
Left-recursion is more efficient and, for large input sets, may be the only viable option.
向左递归更有效，而且对较大的输入集来说，这可能是惟一可行的选择。
How to remove left-recursion in the following grammar?
如何删除下列语法左递归？
How to remove left-recursion in the following grammar?
如何删除下列语法左递归？
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