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- Why did the half-plane half-helicopter not take off http://www.bbc.com/news/magazine-35521040 2 comments
- Why did the half-plane, half-helicopter not work? http://www.bbc.co.uk/news/magazine-35521040 15 comments
- Why did the half-plane, half-helicopter not work? http://www.bbc.co.uk/news/magazine-35521040 10 comments history
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