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Books by default are not in a folder. Imagine they are just thrown into an empty room. The folders are like book shelves in that room and you can pick up books off the floor and stick them in a book shelf. A little unusual is that a book put in a book shelf disappears from the floor (that is still logical), but you can put the book in multiple book shelves with different names (that is like having multiple copies of the same book, but it is the same book).
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