protected void GetFirst()
{
if (First.Count != 0)
{
return;
}
GetLast();
First.AddRange(TraverseLast(Last, current => current.GetPrevPaths()));
}
protected void GetLast(IEnumerable <ColorableClass> startFrom)
{
if (Equals(Last, startFrom))
{
startFrom = new List <ColorableClass>(Last);
}
if (Last.Count != 0)
{
Last.Clear();
}
Last.AddRange(TraverseLast(startFrom, current => current.GetNextPaths()));
}