Gịnị ka okwu ahụ bụ́ 'Ọ' na-ezo aka na ya n'ahịrịokwu nke abụọ? N'iburu ajụjụ nke mbụ n'uche, dee ihe gbara ya gburugburu bụ́ nke ga-enye azịza ya. Ọ nwere ike ịbụ 1 - 20 ahịrịokwu. Ihe ndị gbara ya gburugburu:
Ọkọ akụkọ ihe mere eme bụ́ Francis Aidan Gasquet dere banyere 'Oké Ọrịa Na-efe Efe' na 1893 ma kwuo na "ọ ga-eyi ka ọ bụ ụdị ọrịa ọwụwa anyanwụ ma ọ bụ ọrịa na-efe efe". Ọ nwere ike ịnabata ọrịa ọrịa nke ọrịa bubonic maka Black Death maka mbipụta nke abụọ na 1908, na-etinye oke na fleas na usoro ahụ, na nkọwa ya nabatara nke ọma maka ọrịa ndị ọzọ oge ochie na nke oge ochie, dị ka ọrịa Justinian nke jupụtara na Alaeze Ukwu Rom nke Ebe Ọwụwa Anyanwụ site na 541 ruo 700 OA.