If you leave the maximum timeout length at 4, the program will end and print your currently entered tone sequence.

如果让最大超时长度保留为4，则程序将结束并打印当前输入的音调序列。

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If you leave the maximum timeout length at four, the program will end and print your currently entered knock sequence.

如果我们保留最大超时长度为4秒，那么程序运行到这个时间时就会结束，并打印当前输入的敲打序列。

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For example, you might never notice that the sequence of operations open a document, edit the document, print the whole document, edit one page, print that page doesn't work.

例如，你可能从未注意到一系列的操作：打开文档、编辑文档、打印整个文档、编辑一页、打印该页不能工作。

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