Problem: The region was dominated by Bantu-speaking tribes, who built trade links leading into the Congo River basin. Congo-Brazzaville was formerly part of the French colony of Equatorial Africa. Upon independence in 1960, the former colony of French Congo became the Republic of the Congo. The People's Republic of the Congo was a Marxist–Leninist one-party state from 1970 to 1991. Multi-party elections have been held since 1992, although a democratically elected government was ousted in the 1997 Republic of the Congo Civil War and President Denis Sassou Nguesso has ruled for 26 of the past 36 years.
What year was President Denis Sassou Nguesso ousted? 
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Answer: unanswerable


Problem: In 1795, North Carolina opened the first public university in the United States—the University of North Carolina (now named the University of North Carolina at Chapel Hill). More than 200 years later, the University of North Carolina system encompasses 17 public universities including North Carolina State University, North Carolina A&T State University, North Carolina Central University, the University of North Carolina at Chapel Hill, the University of North Carolina at Greensboro, East Carolina University, Western Carolina University, Winston-Salem State University, the University of North Carolina at Asheville, the University of North Carolina at Charlotte, the University of North Carolina at Pembroke, UNC Wilmington, Elizabeth City State University, Appalachian State University, Fayetteville State University, and UNC School of the Arts, and . Along with its public universities, North Carolina has 58 public community colleges in its community college system.The largest university in North Carolina is currently North Carolina State University, with more than 34,000 students. North Carolina is home to many excellent universities as well as dozens of community colleges and private universities.
What year was the first public university opened in the United States?
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Answer: 1795


Problem: Finally, an introduced species may unintentionally injure a species that depends on the species it replaces. In Belgium, Prunus spinosa from Eastern Europe leafs much sooner than its West European counterparts, disrupting the feeding habits of the Thecla betulae butterfly (which feeds on the leaves). Introducing new species often leaves endemic and other local species unable to compete with the exotic species and unable to survive. The exotic organisms may be predators, parasites, or may simply outcompete indigenous species for nutrients, water and light.
Where does the Prunus spinosa leaf without sunlight? 
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Answer:
unanswerable