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"Which have flown, and which will fly," said Robur, without being in the least disconcerted, "and which we can call streophores, helicopters, orthopters or, in imitation of the word 'nef, which comes from 'navis, call them from 'avis, 'efs, by means of which man will become the master of space. The helix " "Ah, the helix!" replied Phil Evans. "But the bird has no helix; that we know!"
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