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so a index is when you can't find s you will need to go at the back of the book and you wiil find s or the other word

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a chapter is a chapter book that has lots of numbers like chapter 1, chapter 2 and so so.

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A atlas is a big book with map's

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it's a image with arrows like this.

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A contents is when you are going to a book you would have to thick what story what to read.

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A glossary is a mini dictionary the words that you dont know.

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A map is if you want to go around the world you can look at the map to go around
the world.