Assertion: hovercraft's speed | /r/HasProperty | powered by an engine of 50 cc
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Source sentences:
text: —are designed for a maximum speed of 45 km/h (28 mph) powered by an engine of 50 cc (3.1 cu in) or, if it has an electric motor, has a maximum power of 4.0 kW (5.44 PS; 5.36 bhp).