The category of "Marriage" in books encompasses a wide range of literature that explores the institution of marriage, including its joys, challenges, and complexities. These books may delve into the history and cultural significance of marriage, examine the psychological and emotional dynamics of relationships, or offer practical advice and guidance for couples navigating the ups and downs of married life. Whether exploring the intricacies of communication, intimacy, or conflict resolution, books in this category aim to provide insight and support for individuals seeking to build and maintain strong, healthy, and fulfilling marriages.

The category of "Time travel" books typically involves stories where characters travel through time, either intentionally or accidentally, to different eras or periods in history. These books often explore the consequences of altering the past or future, and the challenges and dangers that come with navigating different time periods. Time travel books can span a variety of genres, including science fiction, historical fiction, romance, and adventure, and offer readers a unique perspective on the possibilities and complexities of time travel.

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