By default, the end-of-file string is an underscore (_); if that character is sent as a single input argument, everything after it is ignored.
缺省情况下,文件结束字符串是下划线(_);如果将该字符作为单个输入参数来发送,则它之后的所有内容将被忽略。
Task 2 has a single input criterion, in which two connections end, acting as an implicit join.
Task 2具有一个输入条件,其中接入了两个连接,可充当隐式的join。
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