A flip-flop, and a frequency divider and an RF circuit using the flip-flop. In one embodiment, the system determines whether a yaw rate sensor, a lateral acceleration sensor or a hand-wheel angle sensor has failed. The base layer has a first surface and a plurality of first trenches. When the replaying of the stored content on the television receiver is requested, authentication is performed between the hard disk recorder and the television receiver based on the card ID. The invention also provides pharmaceutical compositions comprising the compounds of the invention and methods of using the compositions in the treatment of various disorders.