Mā te whakarerekētanga ā-wāhanga e whakaohokia ana e ōna hanganga moroiti, ka hurihia e te DOE te ā-wāhanga tuku o te hihi whakamārama, ka whakawehewehea ki ngā momo raupapa. Mā te whakarerekē i te hanganga raupapa me te tawhiti horapa, ka taea te hanga i ēnei raupapa kia pokanoa ki tētahi papa e hiahiatia ana (hei tauira, te mutunga kore, te papa arotahi whakamuri rānei o te arotahi), ka puta ai te kōtaha kaha kua tohua.
E 20 tau te roangaru e arotahi ana ki te whakarato i ngā hua whatu tino tika.