public IEnumerable <IBinaryTreeNode <TItem> > TraversePostorder()
{
var nodes = new List <IBinaryTreeNode <TItem> >();
if (RightNode != null)
{
nodes.AddRange(RightNode.TraversePostorder());
}
nodes.Add(this);
if (LeftNode != null)
{
nodes.AddRange(LeftNode.TraversePostorder());
}
return(nodes);
}
