set pair的用法和样例：
例句
- This reduction also enables us to obtain some information about the number of colourings of a graph with a given set of colours.
这种化法也能使我们得到关于用给定的颜色集对一个图的着色的数目的某些信息。 - Then the IIS after the object reduction is investigated through the set pair analysis.The attribute dependency is obtained and the attributes are further reduced.
用基于集对分析方法的改进集对粗集模型对已进行了对象约简的不完备信息系统进行分析，找出各个属性之间的依赖关系，进一步进行属性约简。
