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15 points
GYROPLANE is validvalid
[n GYROPLANES]
an airplane balanced and supported by the aerodynamic forces acting on rapidly rotating horizontal or slightly inclined airfoils, also GYROCOPTER [n -S]
[n GYROPLANES]
an airplane balanced and supported by the aerodynamic forces acting on rapidly rotating horizontal or slightly inclined airfoils, also GYROCOPTER [n -S]