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21 points
CONVERTAPLANES is validvalid
CONVERTAPLANE, [n]
CONVERTAPLANE, an aircraft that can land and take off vertically by temporarily directing its propulsive thrust downwards, also CONVERTIPLANE, CONVERTOPLANE [n]
CONVERTAPLANE, [n]
CONVERTAPLANE, an aircraft that can land and take off vertically by temporarily directing its propulsive thrust downwards, also CONVERTIPLANE, CONVERTOPLANE [n]