The invention relates to compositions in the form of microemulsion preconcentrates that contain a mixture that consists of a medium-chain triglyceride and an omega-9 fatty acid andor an omega-6 fatty acid; and a surface-active component that contains a polyoxethylene tenside. The PCB has a main section, a connection section, and a curved connecting section arranged between the main section and the connection section and connects the latter such that a main plane of extent of the main section runs at an incline to a main plane of extent of the connection section. In a first accommodating portion for accommodating the first electronic device accommodating box which is defined at the stage close to the ceiling, a hollow duct having two opening faces is arranged. The system includes the ignore bit so that each transaction request that arrives after the ignore bit has been set, does not suffer from a long waiting time before being provided access to the resource.