现有必要对一个有序数据集合重复进行一系列有序操作组成的运算。
It is necessary to perform an computation repeatedly, composed of a series of ordered operations on a set of ordered data.
OWL支持基本的集合操作，即并，交和补运算。
OWL supports the basic set operations, namely union, intersection and complement.
OWL支持基本的集合操作，即并，交和补运算。
OWL supports the basic set operations, namely union, intersection and complement.
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