A polyimide excelling in heat resistance, chemical resistance, water repellency, dielectric characteristics, electrical characteristics, and optical characteristics and a polyamide acid useful as the raw material therefor are provided. The gripping element extends outwardly from the thumb piece so as to permit the gripping element to be positioned a sufficient amount over an edge of a hot item so as to enable the user to move the item. Intermixed cycles among the list of cycles can be resolved. In those situations in which the next following bit sequence is not different, the clock line is triggered without the necessity of testing, and changing the logic level of the data line.