Classifier Instance:

Anchor text: A4W nuclear reactor
Target Entity: A4W_reactor
Preceding Context: All ships of the class are powered by two
Succeeding Context: s, kept in separate compartments. They power four propeller shafts and can produce a maximum speed of over and maximum power of . The reactors produce heat through nuclear fission which heats water. This is then passed through four turbines (manufactured by General Electric) which are shared by the two reactors. The turbines power the four bronze propellers, each with a diameter of and a weight of . Behind these are the two rudders which are high and long, and each weigh . The Nimitz-class ships constructed since also have bulbous bows in order to improve speed and fuel efficiency by reducing hydrodynamic drag. As a result of the use of nuclear power, the ships are capable of operating continuously for over 20 years without refueling and are predicted to have a service life of over 50 years.
Paragraph Title: Propulsion
Source Page: Nimitz class aircraft carrier

Ground Truth Types:

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Predicted Types:

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