You have the following resistor values available to you in the lab in unlimited quantities: 10 Ω, 100 Ω, 470 Ω, 560Ω, 680 Ω, 1.0 k Ω, 2.2 k Ω, and 5.6 k Ω. All of the other standard values are out of stock. A project that you are working on requires an 18 k Ω resistance. What combinations of the available values would you use in series to achieve this total resistance?