Specifying a user name structure that works on all systems and provides enough variability can be a daunting task.

指定一个适用于所有系统的用户名结构并且提供一定的灵活性，这可能是一项棘手的任务。

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How does using ONLY those reduced variability probe sets affect the classification task for which the data set was originally used?

使用那些仅减少变化的探针装置会怎样影响那个数据组被最初使用过的分类任务？

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