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Woks were designed to be used over the traditional Chinese pit-style hearth (Chinese: 灶; pinyin: zào) with the wok recessed into the stove top, where the heat is fully directed at the bottom of the wok. Round grate rings on the edge of the opening provide stability to the wok. There are two styles of traditional wok stoves. The same design aspects of these Chinese stoves can be seen in traditional Japanese kamado stoves. The more primitive style was used outdoors or in well ventilated areas since hot gasses from the firebox exhaust around the wok. The more advanced style, found in better-off households, has a chimney and may be used indoors. These stoves are similar in design to modern rocket stoves.^{[citation needed]}