---

gas → Causes → asphyxiation	0.33
natural gas → HasSubevent → asphyxiation	0.32
carbon monoxide → Causes → asphyxiation	0.32
trachea → HasSubevent → asphyxiation	0.20
carbon dioxide → Causes → asphyxiation	0.19
furnace → Causes → asphyxiation	0.16