public IEnumerable <LcrsTrie> AllNodesDepthFirst()
{
yield return(this);
if (LeftChild != null)
{
foreach (var node in LeftChild.AllNodesDepthFirst())
{
yield return(node);
}
}
if (RightSibling != null)
{
foreach (var node in RightSibling.AllNodesDepthFirst())
{
yield return(node);
}
}
}