public void PruneByRank(long maxRankAllowed)
{
IEnumerable <T> removedItems =
_store
.OrderBy(kvp => kvp.Value)
.Select(kvp => kvp.Key)
.Take((int)Math.Max(0, this.DistinctRepresentedEvents.LongCount() - maxRankAllowed));
foreach (var item in removedItems)
{
_store.RemoveAllCopies(item);
}
_containsUnrepresentedNoiseEvents = true;
}