Why did the USSR make a window between the bathroom and the kitchen?


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Why did the USSR make a window between the bathroom and the kitchen?
Source
Why did the USSR make a window between the bathroom and the kitchen? - Heating, Interior, Construction, Building, Plumbing, Repair, Housing and communal services, Furniture, the USSR, Apartment, Engineer, The property, Electricity, Project
Housing and communal services Engineer Interior Apartment Furniture The property Heating Project Repair Plumbing the USSR Construction Building Electricity
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