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    { "id" : "http://dbpedia.org/resource/Astern_propulsion"
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        "http://www.w3.org/2000/01/rdf-schema#comment" : [ "Astern propulsion (as applied to a ship) is a maneuver in which a ship's propelling mechanism is used to develop thrust in a retrograde direction. Astern propulsion does not necessarily imply the ship is moving astern (in reverse); astern propulsion is used to slow a ship by applying a force in the direction of the stern of the ship, instead of the bow." ] ,
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