public Hash_Set <TKey> Except(Hash_Set <TKey> other) { return(new Hash_Set <TKey>(this.table.Where(x => !other.Contains(x.Key)))); }
public Hash_Set <TKey> IntersectWith(Hash_Set <TKey> other) { return(new Hash_Set <TKey>(this.table.Where(x => other.Contains(x.Key)))); }