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W75: Accidental suffocation and strangulation in bed
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W76: Other accidental hanging and strangulation
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W77: Threat to breathing due to cave-in, falling earth and other substances
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W78: Inhalation of gastric contents
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W79: Inhalation and ingestion of food causing obstruction of respiratory tract
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W80: Inhalation and ingestion of other objects causing obstruction of respiratory tract
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W81: Confined to or trapped in a low-oxygen environment
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W83: Other specified threats to breathing
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W84: Unspecified threat to breathing
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