If one of these bids is cheapest, then the next cheapest bid is the relay. With each response, responder shows or denies control in one or more suits. And these suits are shown with longest first, second longest second, etc. If there is a tie, then the higher ranked suit is shown first. Let's say that we are beginning to cuebid controls.
Responder can show all four controls.
After a round of controls has been shown, the relayer can then ask about the next round of controls. Third and fourth round controls can be shown or denied, if there is bidding room. In other situations, we can ignore singletons after one round of controls. And of course, there is no need to show or deny a void. An alternative to Denial Cuebids is to relay while responder cuebids controls normally, as in non-relay bidding.