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https://oromianeconomist.com/2015/01/14/oromia-the-intricately-carved-xayyaa-tiya-megaliths-of-gadaa-oromo-heritage-of-1249bc-889bc/
Oromia: The Intricately Carved Xayyaa (Tiya) Megaliths of Gadaa Oromo Heritage of 1249BC - 889BC