public static GraphEdge createNormalEdge(int nodeIndex1, int nodeIndex2, @NotNull GraphEdgeType type) {
    assert type.isNormalEdge() : "Unexpected edge type: " + type;
    return new GraphEdge(Math.min(nodeIndex1, nodeIndex2), Math.max(nodeIndex1, nodeIndex2), null, type);
  }
public static GraphEdge createNormalEdge(int nodeIndex1, int nodeIndex2, @NotNull GraphEdgeType type)