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    "# Book database\n",
    "## Try me\n",
    "[![Open In Colab](https://colab.research.google.com/assets/colab-badge.svg)](https://colab.research.google.com/github/ffraile/computer_science_tutorials/blob/main/source/Databases/Extra%20Exercises/Book%20database.ipynb)[![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/ffraile/computer_science_tutorials/main?labpath=source%2FDatabases%2FExtra%20Exercises%2FBook%20database.ipynb)\n",
    "\n",
    "## Problem definition\n",
    "You need to design a database to represent the information of books and authors.\n",
    "You want to store the title of books has a title, and are identified by a book Id. A book can have different authors.\n",
    "An author entity has a country and a name. Authors are identified by a author Id. An author can have contributed to writing different books.\n",
    "\n"
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