可以描述同时执行的操作序列。

You can describe sequences of actions that execute at the same time.

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Input每行是一个测试用例，表示一个操作序列。

Input Each line is a test case that an action sequence.

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Input每行是一个测试用例，表示一个操作序列。

Input Each line is a test case that an action sequence.

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