easy
Illustration for riddle: This is needed both for courage and hardcover books.
Can you figure out this riddle?

This is needed both for courage and hardcover books.

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Common Wrong Answers

Backbone

While 'backbone' is related to courage metaphorically, it does not refer to books in the same way as 'spine' does, which specifically describes the physical part of a book.

Cover

Although 'cover' is a part of hardcover books, it does not relate to courage. 'Spine' is the term that connects both courage and books.

Heart

Though 'heart' can symbolize courage, it has no connection to books, making it an incorrect answer in the context of this riddle.