private static H3.Cell.Edge[] CullValence2Edges( H3.Cell.Edge[] edges )
{
List<H3.Cell.Edge> needRemoval = new List<H3.Cell.Edge>();
// Info we'll need to remove dangling edges.
Dictionary<Vector3D, int> vertexCounts = new Dictionary<Vector3D, int>();
foreach( H3.Cell.Edge edge in edges )
{
CheckAndAdd( vertexCounts, edge.Start );
CheckAndAdd( vertexCounts, edge.End );
}
foreach( H3.Cell.Edge e in edges )
{
if( vertexCounts[e.Start] == 2 ||
vertexCounts[e.End] == 2 )
{
needRemoval.Add( e );
}
}
return edges.Except( needRemoval ).ToArray();
}