 
 <prompt> Wetin be di last word for di passage wey you just read? Given di previous question, write one context wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: ```Small amount of water vapor wey dey inside light bulb fit affect lamp darkening well well. Water vapor dey break into hydrogen and oxygen for hot filament. The oxygen dey attack the tungsten metal, and the tungsten oxide particles wey result dey waka go cooler parts of the lamp. Hydrogen from water vapor dey reduce the oxide, dey form water vapor again and the water cycle dey continue like that. The equivalent of small drop of water wey dey spread over 500,000 lamps go increase darkening well well. Small amount of substances like zirconium dey inside the lamp as getter to react with any oxygen wey fit come out from the lamp components during operation.``` 