Phrase structural rules: The combinational pattern in a linear formula may be called a phrase structural rule or rewrite rule.

用线性式对这种组合模式进行重写并把它称作短语结构规则或重写规则。

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There is one important rule that needs to be followed while modeling combinational logic.

这是为组合逻辑建模的时，必须遵循的一条重要规则。

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