private IEnumerable <IPurchasable> GetPurchasableEquipment() { List <IPurchasable> purchasableItems = new List <IPurchasable> { agentFactory.CreateSnackMachine(TimeSpan.Zero), agentFactory.CreateSodaMachine(TimeSpan.Zero), agentFactory.CreateWaterFountain(TimeSpan.Zero), agentFactory.CreateOfficeDesk(TimeSpan.Zero), agentFactory.CreateTrashBin(TimeSpan.Zero), agentFactory.CreateSnackMachine(TimeSpan.Zero), agentFactory.CreateSodaMachine(TimeSpan.Zero), agentFactory.CreateWaterFountain(TimeSpan.Zero), agentFactory.CreateOfficeDesk(TimeSpan.Zero), agentFactory.CreateTrashBin(TimeSpan.Zero), agentFactory.CreateSodaMachine(TimeSpan.Zero), agentFactory.CreateWaterFountain(TimeSpan.Zero) }; return(purchasableItems); }