What if a feature code is repeated twice in the license file and the licenses are issued on the same day.
If two licenses contain an identical feature code, the order of the feature within the license file determines which license is used first.
i.e. Revit Structure Suite and Building Design Suite both contain the Revit Structure feature code. In the license file, when you combine the licenses make sure Revit Structure is on top so that when starting Revit it will take the Revit Structure pool first before looking at the Suite pool.