static public List <Link> ToList(Link link)
{
List <Link> list = new List <Link>();
SequenceWalker walker = new SequenceWalker(link, list.Add);
walker.WalkFromLeftToRight();
return(list);
}
static public void WalkThroughSequence(this Link link, Action <Link> action)
{
var walker = new SequenceWalker(link, action);
walker.WalkFromLeftToRight();
}