Yang Ya and Zhang Qiang (2012) dabere na nyocha usoro iwu dị mkpa nke akụkọ egwuregwu, nwetara isi ihe ndị na-eduga enweghị afọ ojuju ndị ahịa: nnyefe nke oge, ntinye aka nke ngwaahịa, ọnụ ahịa njehie, nnweta ozi, wdg. Maka ebumnuche nke oge, ma rụọ ọrụ nyocha kwekọrọ ekwekọ, ka ị wee nwee ike ichebe ọdịmma nke ndị ahịa.
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