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