Ko ngā peera roera ngira whakakotahi me te mowhiti o roto, kāore rānei, he peera roera ngira radial me te peera roera porotaka tuaka me te whare kirihou. Kāore he mowhiti o roto, ā, me whai ara reihi rakau kua whakapakeketia, kua hurihia hoki. Mena kāore e taea te whakamahi i te rakau hei ara reihi peera hurihuri, ka taea te whakamahi i ngā mowhiti o roto IR hei whakakapi.
