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