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https://www.washingtonpost.com/wp-apps/imrs.php?src=https://arc-anglerfish-washpost-prod-washpost.s3.amazonaws.com/public/ROHTGHOKCSYQDKJXFS3PHCBODQ.jpg&w=1440The fact that more people weren’t killed in Las Vegas might have more to do with the nature of the materials that started the conflagration, auto and fire experts said.