The preceding grammar has a single rule, input, which will match either blank, comment, class, or section.
上面的语法只有一个规则，即input，它将匹配blank、comment、class或者section规则。
The preceding grammar has a single rule, input, which will match either blank, comment, class, or section.
上面的语法只有一个规则，即input，它将匹配blank、comment、class或者section规则。
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