Nkebi ahịrịokwu nke mbụ: Ụlọ ngosi ihe osise a bụ ebe ncheta Hiram Sibley, bụ́ nwa nwa James George Averell. Nkebi ahịrịokwu nke abụọ: Ụlọ ihe ngosi ahụ bụ ebe ncheta Hiram Sibley, bụ́ nwa nwa James George Averell. Ajụjụ: Ọ̀ bụ otu ihe ka ahịrịokwu nke mbụ na nke abụọ pụtara? Ee ma ọ bụ Ee e?
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