| 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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