With no explanation, label text_A→text_B with either "not_related" or "related".
text_A: Silicon Valley is in southern California.
text_B: Eliri is an ethnic group in Sudan .. Sudan. Sudan. Eliri. Eliri language. The members of this group speak Eliri and live in South Kurdufan .. Eliri. Eliri language. South Kurdufan. South Kurdufan. This group numbers fewer than 10,000 members .. Category  : Nuba peoples. Category  : Ethnic groups in Sudan. Sudan. Sudan
not_related.