A system for allowing a telephone subscriber to effectively monitor and select incoming telephone calls wherein a single actual telephone number and incoming telephone line comprises a plurality of virtual telephone numbers. A slave clip includes a carrier strip located within the main body and a plurality of clips extending from the carrier strip, each positioned within a corresponding hole of the main body to make the corresponding one of the clips of the main clip. The toner production management system receives the information from the toner container filling device, and determines the amount of toner to be produced at a toner production base and time of delivering toner to the toner container filling base according to the received information. The hypergraphs consist of hyperedges and vertices residing in tables of indices that point into each other in a flat organization. This method can be implemented in connection with a telephone company central office switch, a modified custom calling service or be made accessible to individual telephone subscribers using computerized customer premises equipment.