A na-eresị ndị na-eme ice ice nke OMT nke ọma n'ụwa niile, anyị nwere ọtụtụ igwe eji eme ice na Africa, dịka Nigeria, Ghana, Kenya, Tanzania, Zimbabwe na South Africa wdg, yana ndị ahịa na UK, America, South East Asia wdg. nọgide na-enyocha ma nyochaa ọnọdụ ọrụ na nzaghachi nke ndị ahịa na igwe na-eme ice. Anyị na-emeziwanye ogo na ọrụ nke ngwaahịa anyị mgbe niile ma na-ewusi njikwa otu, na-ekwusi ike na-ewere àgwà na ọrụ dị ka nke mbụ.