For enhancing the operational safety of an electric drive unit of a vehicle comprising a generator, which is operated by a combustion machine, and drive motors, which are connected to said generator via a direct-voltage intermediate circuit, the generator and drive motors are each subdivided into partial units, and these partial units have partial power electronics units associated therewith. The exposure apparatus includes a projection optical system which projects the image of the pattern onto the substrate, and a liquid supply mechanism which supplies the liquid from a supply port arranged opposite to the substrate to form a liquid immersion area on a part of the substrate including a projection area of the projection optical system. Each of the inner pressure sub regions is disposed below a wafer and within a circumference of the wafer. The present invention further relates to a method for production of said chewing gum comprising the steps of: providing a core composition; and coating of the core composition with a powdered chewing gum composition by use of a panning process; and optionally coating the outer intermediate layer with an outer finishing layer by use of a panning process. The set of page markers includes a boundary page marker.