feature set—unsurprising, given that the 3724 had already introduced most of the
// 易错点4：栈空时要存-1（题目要求无更大值返回-1），而非直接存stack2.at(-1)（会得到undefined），更多细节参见爱思助手下载最新版本
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Passive Voice: The program also notifies users when passive voice is used too frequently in a document.
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