Said Chair without stool, not because there is no stool is derived later chairs.
Chair, the first not the stool we sit today, which refer specifically to the pedal or pedal. As a Chair, is what comes after. This Chair to the more commonly used in the Song dynasty. Chairs, stools next to a Chair, stool forms in the period of Ming and Qing dynasties, long long large stool, stool, bench, stool, five-stool, plum stools.