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“By marking the number and book information on the card like this and classifying them by author, title, and subject, it will be really fast to find a book.”
She let out an exclamation.
“You understand quickly.”
I drew a ring on the paper that could be opened and closed. It was the ring used in the Kumon study materials.
“After punching a hole in the index card, you can use this ring to freely insert and remove the card. As the number of books continues to grow, i ...
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