For US production standards if a new scene is to be inserted between scenes 10 and 11, the new scene will be numbered A11 (and not 10A as "10A" would refer to setup "A" of scene 10, when using the American slating system – see slating procedures). For some productions, it may be necessary to insert a scene between 10 and A11 – this scene is then numbered AA11. A scene between A11 and 11 would be numbered B11. A scene between A11 and B11 would be numbered AB11.