In this task, you're expected to write answers to questions involving multiple references to the same entity. The answer to the question should be unambiguous and a phrase in the paragraph. Most questions can have only one correct answer.

Input: Consider Input: Passage: The Tang dynasty was largely a period of progress and stability in the first half of the dynasty's rule, until the devastating An Lushan Rebellion (755-763) and the decline of central authority in the later half of the dynasty. Like the previous Sui dynasty, the Tang dynasty maintained a civil-service system by recruiting scholar-officials through standardized examinations and recommendations to office.  The rise of regional military governors known as jiedushi during the 9th century undermined this civil order.  Chinese culture flourished and further matured during the Tang era; it is traditionally considered the greatest age for Chinese poetry.  Two of China's most famous poets, Li Bai and Du Fu, belonged to this age, as did many famous painters such as Han Gan, Zhang Xuan, and Zhou Fang.  Scholars of this period compiled a rich variety of historical literature, as well as encyclopedias and geographical works. The adoption of the title Tängri Qaghan by the Tang Emperor Taizong in addition to his title as emperor was eastern Asia's first "simultaneous kingship".Many notable innovations occurred under the Tang, including the development of woodblock printing.  Buddhism became a major influence in Chinese culture, with native Chinese sects gaining prominence.  However, in the 840s the Emperor Wuzong of Tang enacted policies to persecute Buddhism, which subsequently declined in influence. Although the dynasty and central government had gone into decline by the 9th century, art and culture continued to flourish. The weakened central government largely withdrew from managing the economy, but the country's mercantile affairs stayed intact and commercial trade continued to thrive regardless. However, agrarian rebellions in the latter half of the 9th century resulted in damaging atrocities such as the Guangzhou massacre of 878–879. 
Question: Under what dynasty were the jiedushi created?

Output: Tang dynasty.


Input: Consider Input: Passage: During his stay in Puerto Rico, Thompson acquired a fairly fluent, although informal and at times incorrect, use of Spanish, which he has continued throughout his career. Several early Pixies songs, including "Isla de Encanta" and "Vamos", reference his experiences in San Juan, and the lyrics are often heavily seasoned with the island's slang. The island's influence in his work is most notable in the song "Isla De Encanta", named after the island's motto, "Isla Del Encanto". Other Pixies songs drawn from his experiences there include "Vamos" (Come On Pilgrim), "Oh My Golly!", "Where Is My Mind?" (Surfer Rosa), "Crackity Jones" (Doolittle) and the B-side "Bailey's Walk". Several of his songs contain Spanish lyrics, most notably in the Pixies' first album, Come On Pilgrim, and a Spanish translation of "Evil Hearted You" by The Yardbirds. From his later works with the Pixies onwards, his use of Spanish drifted westward, reflecting places and aspects of the state of California and its culture.Thompson's lyrics are noted for their obscure references to off-beat topics such as outer space, UFOs, and The Three Stooges—the last of these being the subject of "Two Reelers", a song from Teenager of the Year. Lyrics with a focus on science fiction were particularly prominent on the later Pixies records, as well as his early solo albums. With the Catholics, his lyrics have tended towards historical topics; for example, the song "St. Francis Dam Disaster" (from Dog in the Sand) details the catastrophic collapse of the St. Francis Dam near Los Angeles in March 1928, and the All My Ghosts EP featured an account of the Humboldt County Massacre of Wiyot Indians in 1860 near Eureka, California. 
Question: What is the name of the island whose motto is, "Isla Del Encanto," after which the Pixies song is named?

Output: Puerto Rico.


Input: Consider Input: Passage: Ieoh Ming Pei, FAIA, RIBA (born 26 April 1917), commonly known as I. M. Pei, is a Chinese American architect.  Born in Guangzhou and raised in Hong Kong and Shanghai, Pei drew inspiration at an early age from the gardens at Soochow. In 1935, he moved to the United States and enrolled in the University of Pennsylvania's architecture school, but quickly transferred to the Massachusetts Institute of Technology. He was unhappy with the focus at both schools on Beaux-Arts architecture, and spent his free time researching emerging architects, especially Le Corbusier. After graduating, he joined the Harvard Graduate School of Design (GSD) and became a friend of the Bauhaus architects Walter Gropius and Marcel Breuer. In 1948, Pei was recruited by New York City real estate magnate William Zeckendorf, for whom he worked for seven years before establishing his own independent design firm I. M. Pei & Associates in 1955, which became I. M. Pei & Partners in 1966 and later in 1989 became Pei Cobb Freed & Partners. Pei retired from full-time practice in 1990. Since then, he has taken on work as an architectural consultant primarily from his sons' architectural firm Pei Partnership Architects.
Pei's first major recognition came with the National Center for Atmospheric Research in Colorado (designed in 1961, and completed in 1967). His new stature led to his selection as chief architect for the John F. Kennedy Library in Massachusetts. He went on to design Dallas City Hall and the East Building of the National Gallery of Art. He returned to China for the first time in 1975 to design a hotel at Fragrant Hills, and designed Bank of China Tower, Hong Kong, a skyscraper in Hong Kong for the Bank of China fifteen years later. In the early 1980s, Pei was the focus of controversy when he designed a glass-and-steel pyramid for the Musée du Louvre in Paris. He later returned to the world of the arts by designing the Morton H. Meyerson Symphony Center in Dallas, the Miho Museum in Japan, the Suzhou Museum in Suzhou, Museum of Islamic Art in Qatar, and the Grand Duke Jean Museum of Modern Art, abbreviated to Mudam, in Luxembourg.
Pei has won a wide variety of prizes and awards in the field of architecture, including the AIA Gold Medal in 1979, the first Praemium Imperiale for Architecture in 1989, and the Lifetime Achievement Award from the Cooper-Hewitt, National Design Museum in 2003. In 1983, he won the Pritzker Prize, sometimes called the Nobel Prize of architecture. 
Question: What is the last name of the person who established their own independent design firm?


Output: Pei.