ToolBar必须定义成以下两种完全互异的样式之一。
ToolBars must be defined as one of two mutually exclusive styles.
在结点互异或结点重合时，将函数差商与其导数之间的关系式推广为关于两个函数的情形。
Thie relationship between divided difference and derivative of a function can be generalized for two functions which the knots are distinct or the knots are coincident.
然而，这些算法在处理基于片断互异出现的支持度计数时，效率很低甚至无效。
However, these algorithms are not efficient, or even incapable, when dealing with the distinct occurrences based frequency counting of an episode which is essentially more effective.
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