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Answer: Context: Keystone is an unincorporated community and census-designated place in central Keith County, Nebraska, United States. It lies along local roads near the North Platte River, northeast of the city of Ogallala, the county seat of Keith County. Its elevation is 3,100feet (945m). Although Keystone is unincorporated, it has a post office, with the ZIP code of 69144.

Hypothesis: The income of Keystone's unincorporated postal workers tends to increase every year.

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Answer: Context: Hakea gibbosa, commonly known as hairy hakea or rock hakea, is a shrub of the family Proteaceae native to southeastern Australia. It has become an environmental weed in South Africa and New Zealand, where it had been introduced for use as a hedge plant.

Hypothesis: Hakea gibbosa is commonly known as "hairy rock".

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Answer: Context: Gay Sex in the 70s is a 2005 American documentary film about gay sexual culture in New York City in the 1970s. The film was directed by Joseph Lovett and encompasses the twelve years of sexual freedom bookended by the Stonewall riots of 1969 and the recognition of AIDS in 1981, and features interviews with Larry Kramer, Tom Bianchi, Barton Lidice Benes, Rodger McFarlane, and many others.

Hypothesis: Gay Sex in the 70s was directed by a gay man.

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Answer:
Context: Peter L. N. Padfield (born 1932) is a British author, biographer, historian, and journalist who specializes in naval history and in the Second World War period. His early journalism appeared under the name P. L. N. Padfield. As well as his non-fiction work, he has also published four novels.

Hypothesis: Padfield specialized in space travel.