Ko ngā peera roera porotaka rarangi rua e whakaatu ana i ngā mowhiti totoka o roto, o waho hoki, me ngā huānga hurihuri e arahina tika ana i waenga i ngā rara. Nā te hoahoa kore-kereke, ka taea e rātou te pupuri i te maha o ngā roera, ka hua ake he uara whakatauranga kawenga teitei ake. I tētahi atu taha, ka taea e rātou te tuku i te tere hurihuri mōrahi kia iti iho i te hoahoa kua keria. Kei te wātea i roto i ngā hoahoa kore-tauwāhi, haurua-tauwāhi me te tauwāhi, ko ēnei peera te otinga hangarau tika i roto i ngā mara me ngā tono maha.
