rebalance_delta_zone
rebalance_delta_zone(delta_zone, 1, delta_zone->list_count + 1);
rebalance_delta_zone(delta_zone, middle + 1, last);
rebalance_delta_zone(delta_zone, first, middle);
rebalance_delta_zone(delta_zone, first, middle);
rebalance_delta_zone(delta_zone, middle + 1, last);