What are the wooden dolls that fit inside each other?

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Tags

1. #sometimes
2. #other
3. #inside
4. #refers
5. #known
6. #wikipedia
7. #placed
8. #nesting
9. #grandmother
10. #matryoshka
11. #babushka
12. #referred
13. #nested
14. #incorrectly
15. #russian
16. #decreasing
17. #wooden
18. #dolls