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