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hypoxia × 16medical × 5
cabin-pressure × 4
physiological × 4
emergency × 3
oxygen × 3
safety × 2
altitude × 2
passenger × 2
high-altitude × 2
aircraft-design × 1
faa-regulations × 1
airliner × 1
commercial-aviation × 1
ppl × 1
boeing-777 × 1
mh370-incident × 1