Given a set, weights, and an integer desired_weight, remove the element of the set that is closest to, but not greater than desired_weight, and associate it with the variable actual weight. for example, if weights is (12, 19, 6, 14, 22, 7) and desired_weight is 18, then the resulting set would be (12, 19, 6, 22, 7) and actual_weight would be 14. assume there is at least one value in the set that is less than desired_weight.