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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: Keystone is an unincorporated community and with 59 people on their census in central Keith County, Nebraska, United States.

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Answer: Context: Tony Sanchez, also known as Spanish Tony (died 2000), was a British photographer of Spanish ancestry. He worked as Keith Richards' assistant for eight years and co-wrote with John Blake a bestselling memoir about this time, entitled "Up and Down with the Rolling Stones: My Rollercoaster Ride with Keith Richards" (1979).

Hypothesis: Tony Sanchez was born in nineteen hundred fifty two.

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Answer: Context: In theoretical physics, particularly in discussions of , Mach's principle (or Mach's conjecture) is the name given by Einstein to an imprecise hypothesis often credited to the physicist and philosopher Ernst Mach. The idea is that local inertial frames are determined by the large scale distribution of matter, as exemplified by this anecdote:

Hypothesis: Mach is not just a scientist.

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Answer:
Context: Repeat Performance is a 1947 American film noir crime film starring Louis Hayward and Joan Leslie. The time travel picture combines elements of a 1940s drama with a science fiction twist. The film was released by Eagle-Lion Films, directed by Alfred L. Werker, and produced by Aubrey Schenck.

Hypothesis: Repeat Performance is a noir crime film that has a sci-fi twist