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/// @startDocuBlock edgeCollectionEdges
/// @brief selects all edges for a set of vertices
/// edge-collection.edges(vertex)
///
/// The edges operator finds all edges starting from (outbound) or ending
/// in (inbound) vertex.
///
/// edge-collection.edges(vertices)
///
/// The edges operator finds all edges starting from (outbound) or ending
/// in (inbound) a document from vertices, which must a list of documents
/// or document handles.
///
/// @EXAMPLE_ARANGOSH_OUTPUT{EDGCOL_02_Relation}
/// db._create("vertex");
/// db._createEdgeCollection("relation");
/// ~ var myGraph = {};
/// myGraph.v1 = db.vertex.insert({ name : "vertex 1" });
/// myGraph.v2 = db.vertex.insert({ name : "vertex 2" });
/// | myGraph.e1 = db.relation.insert(myGraph.v1, myGraph.v2,
/// { label : "knows"});
/// db._document(myGraph.e1);
/// db.relation.edges(myGraph.e1._id);
/// ~ db._drop("relation");
/// ~ db._drop("vertex");
/// @END_EXAMPLE_ARANGOSH_OUTPUT
///
/// @endDocuBlock
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