The ratio of the number of connection sequences started upon reception of a connection request signal transmitted from the mobile terminals to the number of completed connection sequences is monitored, and on the basis of the monitoring result, the presence or the absence of a congestion state in the communications network is evaluated. More specifically, some embodiments provide potentiator compositions, which include at least one active substance, such as a sweetener, and at least one potentiator, such as a sweetness potentiator, which enhances the sweetness of the composition upon consumption. One or more seat cushion covers and one or more back cushions covers cover the one or more seat cushions and back cushions, respectively. The tapered outer surfaces also serve to deflect impact forces to the housing to help prevent unauthorized removal of the device. The holder rotating device is arranged to rotate the engaging member while permitting a movement of the engaging member in at least a direction of turning of each nozzle holder by the turning device.