A method, apparatus, and computer-readable storage media for managing orphan tokens in a business process system. The electrical control structure and the electrical lugs are held together by a retaining system including a magnetic arrangement contacted by a biasing arrangement for providing a magnetic biasing force. Each of the regions is analysed in respect of a plurality of visual properties, each of which is ascribed a number according to the value of the visual property. A circuit further comprises a coefficient coupling, which receives the output voltage provided by the first transistor and the second transistor, providing a switching function for a circuit output current. A snow guard is provided on the ski body, to prevent snow or ice from hindering operation of the wheel unit.