That really is a good question.
We estimated the costs that have already been committed to build type 26 ships, at least up to this point. We then estimated the costs for building three type 26 ships.
We also included the costs of restarting a competitive procurement process to choose another type of ship. Those costs would include updating a shipyard in order to retool the equipment and the shipyard in order to build another type of ship.
So we included all the costs we would have to incur to continue building the ship, and also those that we would have to incur if we were to start almost at square one again, in terms of productivity and expertise, in order to build a different type of ship. That's how we were able to produce hybrid cost estimates for the FREMM and the type 31e ships.