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Sigma KEE - Tree
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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
树是一个没有 GraphLoopDirectedGraph
Relationships      
Parents 有向图 The Class of directed graphs. A directed graph is a Graph in which all GraphArcs have direction, i.e. every GraphArc has an initial node (see InitialNodeFn) and a terminal node (see TerminalNodeFn).


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