Help with command.

    class Wizard : Command
    {
        public Wizard(): base("wizard", 0) 
        {

        }

        protected override bool Process(Player player, RealmTime time, string[] args)
        {
            if (player.Inventory[4] == null && player.Inventory[5] == null &&
                player.Inventory[6] == null && player.Inventory[7] == null)//simple check if 4,5,6,7 is empty
            {
                player.Inventory[4] = player.Manager.GameData.Items[0xaa2]; // Astral
                player.Inventory[5] = player.Manager.GameData.Items[0xa30]; // MNova
                player.Inventory[6] = player.Manager.GameData.Items[0xa96]; // Elder
                player.Inventory[7] = player.Manager.GameData.Items[0xacd]; // Exa HP

                player.UpdateCount++;
                player.SendInfo("Success");
                return true;
            }
            else
            {
                player.SendError("Slots 1, 2, 3 or 4 is being used!");
                return false;
            }
        }
    }