public ItemFight GetNextFight()
{
SignitureItem left = LeftGroup.TakeLastItem();
SignitureItem right = RightGroup.TakeLastItem();
return(new ItemFight(left, right, this));
}
internal void RightWins(ItemFight mergeSortFight)
{
_sortedItems.Add(mergeSortFight.Right);
LeftGroup.ReturnItem(mergeSortFight.Left);
PotentiallyComplete();
}