E ai ki te take o te pukapuka kōrero kia whakamārama, kia whakamārama hoki i ngā tauira o ngā uara, whanonga, ngā whanonga, me te reo o tētahi rōpū tiri ā-ahurea, a Erīhi, (1968), kia mōhio hoki ko Agar (1980) he tukanga taua pukapuka me te hua o te rangahau.