What is the third tallest mountain in Africa?
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The main category of the book , Africa , is the unknown entity .
What is the third tallest mountain in Africa?</s>The [unused1]None                [unused2] main
What is the third tallest mountain in Africa?</s>The main topic of the article, titled  Unknown Entity '', is Africa.
What is the third tallest mountain in Africa?</s>The [unused1]None                [unused2] main
What is the third tallest mountain in Africa?</s>The main category of the book , Africa , is the unknown entity .
What is the third tallest mountain in Africa?</s>Africa,0,Africa,Africa,topic's main category,[unused1]None[unused2],[unused1]None[unused2],category's main topic,Africa,[unused1]None[unused2],0,[unused1]None[unused2]
What is the third tallest mountain in Africa?</s>Africa,0,Africa,Africa,topic's main category,None,None,category's main topic,Africa,None,0,None