Another is that sorting frequent item of not fuzzy attributes in descending order of their support firstly,then sorting database fuzzy attributes with frequent item in ascending order of their nodes number in FFP tree.

• 先对非模糊属性下的频繁项目按支持度从大到小进行排序,再对模糊属性按其在FFP-树中包含的不同结点的个数,从少到多进行排序,然后依次将各属性下的频繁项目插入到头表中。