If one of them [i.e. the props] was removed, the remaining ones contract impurity by contact but not through air-space, the words of Rabbi Meir. Rabbi Shimon says that they are clean. If originally he made two props, one opposite the other, they contract impurity by contact and through air-space; the words of Rabbi Meir. Rabbi Shimon says that they are clean. If they were more than three fingerbreadths high, the parts that are three fingerbreadths high and below contract impurity by contact and through air-space but the parts that are more than three fingerbreadths high contract impurity by contact and not through air-space; the words of Rabbi Meir. Rabbi Shimon says that they are clean. If they were withdrawn from the rim [of the stove], the parts which are within three fingerbreadths contract impurity by contact and through air-space, and those parts that are removed more than three fingerbreadths contract impurity by contact but not through air-space, the words of Rabbi Meir. Rabbi Shimon says that they are clean.