This is the root condition for graph errors that have to do with edges.
| graph-error | This is the root condition for errors that occur while running code in CL-Graph.  | 
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| graph-vertex-not-found-in-edge-error | This condition is signaled when a vertex can not be found in an edge.  | 
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| edge | The `edge` that is implicated in the condition. Initargs::edge; Reader:edge. | 
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| graph | The `graph` of which this edge is a part. Initargs::graph; Reader:graph. |