public OrderedSequence(SortableInvariant <T, V> x, IEnumerable <T> tt)
: this(x)
{
var initial = new OrderedSequence <T, V>(x);
foreach (T t in tt)
{
initial = initial.PushRight(new OrderedElement <T, V>(t, x));
}
_finger = initial._finger;
}
public OrderedSequence <T, V> Merge(OrderedSequence <T, V> o) => new OrderedSequence <T, V>(_x, Merge(_finger, o._finger));
