Aah. The russian doll thing. Uninteresting.
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A pig(Google pigs in a blanket)
What is meant to be in the blanket? A chicken? A rat? Or maybe a naked mole rat?
Riddle: What is inside a blanket = a blanket
Inside a blanket there are smaller humans, we don't know this but our blanket is a planet for the humans called atoms, what a world we live in!
Riddle: What is inside a blanket =what