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