Swap help please

Alpha and Beta Companies can borrow for a five-year term at the following rates: Design an interest rate swap in which Alpha and Beta share the cost savings in the proportion of 2:1. Assume Alpha desires floating-rate debt and Beta desires fixed-rate debt. No swap bank is involved in this transaction. Consider the information given in part 5.4) and assume now that a swap bank is involved as an intermediary. Briefly describe how this would change the cost savings in the borrowing costs of both Alpha and Beta companies. You can choose in this case whether the two companies have asymmetry in cost saving or whether they save the same cost