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| na-tech event (natural events (known as Na-Tech, or from the English term 'natural hazards triggering technological accidents) MichaelBurov); Na-Tech accident (Na-Tech accident; Na-Tech: natural events (known as Na-Tech, or from the English term 'natural hazards triggering technological accidents) MichaelBurov); Na-Tech (Na-Tech accident; Na-Tech: natural events (known as Na-Tech, or from the English term 'natural hazards triggering technological accidents) MichaelBurov) | |||