The two men swapped places, always extinguishing the light when they changed over.
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Related: swap
Prev: At a clothes swap event the women can give away unwanted clothing and get something different in return.
Next: The low-carbohydrate food movement gave birth to such diets as the Atkins, Paleo and Keto, which advised swapping foods like bread, pasta and potatoes for vegetables, fish and meat.
