Nkebi ahịrịokwu nke mbụ: E bidoghachiri ide, igwu egwu na ịdekọ egwu n'afọ 2009 maka ihe ndị metụtara onwe ya ma kwụsị n'afọ 2015. Nkebi ahịrịokwu 2: Becker kwụsịrị ide, ịkpọ egwu na ịdekọ egwu n'afọ 2009 maka ihe ndị metụtara onwe ya ma maliteghachi na 2015. Ajụjụ: Ọ̀ bụ otu ihe ka ahịrịokwu nke mbụ na nke abụọ pụtara? Ee ma ọ bụ Ee e?
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