Input: Article: The city remained in the hands of Christian troops until 1102, when the Almoravids retook the city and restored the Muslim religion. Although the self-styled 'Emperor of All Spain', Alfonso VI of León and Castile, drove them from the city, he was not strong enough to hold it. The Christians set it afire before abandoning it, and the Almoravid Masdali took possession on 5 May 1109. The event was commemorated in a poem by Ibn Khafaja in which he thanked Yusuf ibn Tashfin for the city's liberation.The declining power of the Almoravids coincided with the rise of a new dynasty in North Africa, the Almohads, who seized control of the peninsula from the year 1145, although their entry into Valencia was deterred by Ibn Mardanis, King of Valencia and Murcia until 1171, at which time the city finally fell to the North Africans. The two Muslim dynasties would rule Valencia for more than a century.

Now answer this question: In what year did Christian troops lose control of Valencia?

Output: 1102

Input: Article:  South Korea: The event was held in Seoul, which hosted the 1988 Summer Olympics, on April 27. Intended torchbearers Choi Seung-kook and Park Won-sun boycotted the event to protest against the Chinese government's crackdown in Tibet. More than 8,000 riot police were deployed to guard the 24-kilometre route, which began at Olympic Park, which was built when Seoul hosted the 1988 Summer Games. On the day of the torch relay in Seoul, Chinese students clashed with protesters, throwing rocks, bottles, and punches. A North Korean defector whose brother defected to China but was captured and executed by the DPRK, attempted to set himself on fire in protest of China's treatment of North Korean refugees. He poured gasoline on himself but police quickly surrounded him and carried him away. Two other demonstrators tried to storm the torch but failed. Fighting broke out near the beginning of the relay between a group of 500 Chinese supporters and approximately 50 protesters who carried a banner that read: "Free North Korean refugees in China." The students threw stones and water bottles as approximately 2,500 police tried to keep the groups separated. Police said they arrested five people, including a Chinese student who was arrested for allegedly throwing rocks. Thousands of Chinese followed the torch on its 4.5 hour journey, some chanting, "Go China, go Olympics!" By the end of the relay, Chinese students became violent, and it was reported in Korean media that they were "lynching" everyone who was disagreeing with them. One police man was also rushed to hospital after being attacked by Chinese students. On Apr 29, the Secretary of Justice, Kim Kyung Han, told the prime minister that he will find "every single Chinese who was involved and bring them to justice." Later in the day, South Korea's Prosecutor's Office, National Police Agency, Ministry of Foreign Affairs and National Intelligence Service made a joint statement saying that they will be deporting every Chinese student that was involved in the incident. China defended the conduct of the students.

Now answer this question: Which Olympics did Seoul host?

Output: 1988 Summer Olympics

Input: Article: In coniferous or softwood species the wood cells are mostly of one kind, tracheids, and as a result the material is much more uniform in structure than that of most hardwoods. There are no vessels ("pores") in coniferous wood such as one sees so prominently in oak and ash, for example.

Now answer this question: What type of cells makes up most wood cells in coniferous trees?

Output:
tracheids