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Ọtụtụ mmadụ nwere olileanya na Nkwekọrịta Maka Ịkwụsị Mmụba Ngwá Agha Nuklia Nuclear Non - Proliferation Treaty , nke a na - akpọ NPT , bụ nke a nabatara nafọ 1968 ga - egbo mkpa a . 