A dog is trained to hunt by using a unit that resembles a bird first as a toy and then as a training element. The input pattern is type cast to a Boolean alphabet and is then processed to create a corresponding signature set. Any type of switching circuit used within an IMD may be implemented using this technology. The polyester elastomer composition is excellent in terms of hydrolysis resistance, heat resistance, oil resistance, wear resistance, and impact resistance. The invention provides a high-productivity, highly efficient method for continuously producing a fatty acid salt and a method for effectively producing a fatty acid salt having a high unsaturated fatty acid content and a low melting temperature.