Assertion: baker's year | /r/HasProperty | spent on sudan–ethiopian frontier
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text: After a year spent on the Sudan–Ethiopian frontier, during which time he learned Arabic, explored the Atbara river and other Nile tributaries, and proved that the Nile sediment came from Ethiopia, he arrived at Khartoum, leaving that city in December 1862 to follow up the course of the White Nile.