This condition is signaled when a vertex can not be found in an edge.
| edge-error | This is the root condition for graph errors that have to do with edges. |
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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. |
| vertex | The vertex or value that could not be found in the graph. Initargs::vertex; Reader:vertex. |