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Sigma KEE - GraphArc
KB Term: 

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图弧
Graph 是由 GraphNode 和 GraphArc 组成，每个 GraphArc 都会联系两个 GraphNode。
Relationships      
Parents 图元素 Noncompositional parts of Graphs. These parts are restricted to GraphNodes and GraphArcs.
Children 图环路A GraphArc in which a GraphNode is linked to itself.


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