@Override
    public String remove(String hashKey) {
        if (manager.remove(hashKey) == null) {
            return "Error: No match to object!";
        } else {
            if (hashKey.startsWith("A")) {
                aisleCount--;
            } else if (hashKey.startsWith("R")) {
                rackCount--;
            }
            return "Remove: OK";
        }
    }