Things inside this house are indeed outside that house.
An apartment inside an apartment complex is still inside the same building. Earth is in the Universe. There's a difference between "in the Universe" and "outside of Earth".
A superset also includes everything in all its subsets.
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An apartment inside an apartment complex is still inside the same building. Earth is in the Universe. There's a difference between "in the Universe" and "outside of Earth".
A superset also includes everything in all its subsets.