You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "Yelü Chucai was a retainer of which founder of the Mongol Empire?" whose answer is Genghis Khan.
Each document should contain about 30 words, and these documents should contain useful information.

Query: Yelü Chucai and founder of the Mongol Empire
Useful Output:

Doc 1: This article is about an outstanding political figure Yelü Chucai (1189–1242), who was the main advisor of the Mongol khans. Due to his
Doc 2: Yelü Chucai (1190 - 1240 AD) was a Khitan official for the Jin dynasty and early Mongol Empire. He promoted Chinese-style administration and
Doc 3: The Yuan Dynasty (元朝, Yuán), spanning 1279 to 1368, holds a significant place in Chinese history as the first unified empire established by a minority ethnic
Doc 4: Portrait of Yelü Chucai, an administrator of the early Mongol EmpireStrangely, the Mongols had considered turning all of North China into pastureland for their
Doc 5: Was Yelü Chucai one of the most influential people in history? When Mongols conquered China, Mongol decided to kill the entire population, it