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Through the toilet
If you do not know, the rat can easily get into the apartment through an airlock in the toilet. And if you can rat, then maybe a boa constrictor. What actually happened. Where was the case, do not know, but the logic remains the same - always look into the toilet, before landing. Not a boa constrictor, the other stuff you can declare in gosti.
Source: mirfactov.com/