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The Aero A.21 was a biplane military trainer aircraft developed in Czechoslovakia from the Aero A.11 reconnaissance-bomber.
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This article gives an overview of the aquatic communities in the British National Vegetation Classification system.
The Arrows A21 was the car with which the Arrows Formula One team competed in the 2000 Formula One season.
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The English Opening is a chess opening that begins with the move: A flank opening, it is the fourth most popular and, according to various databases, anywhere from one of the two most successful to the fourth most successful of White's twenty possible first moves.
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The Focke-Wulf A 17 Möwe (German: "Gull") was an airliner built in Germany in the late 1920s.
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This is a list of roads designated A21.
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The Stearman Model X-100 was a competitor in an United States Army Air Corps competition for a twin-engined attack aircraft which (after redesigns) led to the Douglas A-20 Havoc, Martin A-22 Maryland and North American B-25 Mitchell.
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