Here's how it would work having a 2 for 1 contract with Texas, ND, and Ohio State in odd number years and Wisconsin, Michigan, and Nebraska in even number years.
Year 1 @Texas, @ND, Ohio State, FCS
Year 2 @Wisconsin, @Michigan, Nebraska, FCS
Year 3 @Texas, @Ohio State, Notre Dame, FCS
Year 4 @Wisconsin, @Nebraska, Michigan, FCS
Year 5 @ND, @Ohio State, Texas, FCS
Year 6 @Nebraska, @Michigan, Wisconsin, FCS