Nkebi ahịrịokwu 1: The ` ` Working Model "'dị 78 cm n'ịdị elu na 79 & nspb; ogologo. Nkebi ahịrịokwu nke 2: ` ` ọrụ nlereanya'' bụ 78 cm elu na 79 ogologo. Ajụjụ: Ọ̀ bụ otu ihe ka ahịrịokwu nke mbụ na nke abụọ pụtara? Ee ma ọ bụ Ee e?
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