Compounds of the formula: are useful for the treatment of depression, anxiety, panic disorder, post-traumatic stress disorder, premenstrual dysphoric disorder, attention deficit disorder, obsessive-compulsive disorder, social anxiety disorder, generalized anxiety disorder, obesity, eating disorders, vasomotor flushing, cocaine and alcohol addiction, sexual dysfunction and related illnesses. According to the present invention, the VSB transmission system includes a convolutional encoder for encoding an input signal, a trellis-coded modulation encoder for encoding the convolutionally encoded signal, and a signal mapper mapping the trellis-coded signal to generate a corresponding output signal. A set of scalars may be determined based on a modulation order, a signal-to-noise ratio for the symbol, and a bit of the symbol. The operation of the controller is overridden with the expert system when one of the predetermined conditions exists and taking the associated action by the expert system to control the operation of the process by changing one or more of the manipulatible variables. The grinder may be moved vertically or horizontally with respect to the base upon which it is secured.