def find_unobtainable_books(user_preferences): user_shelf = {'proposal': 'design patterns', 'restart_with_a_clean_slate': 'atomic habits', 'predismissal': 'outliers', 'shut_eyes_to': 'fiction classics'}; for book in user_shelf.values(): if book not in user_preferences: print(f"even if it seems unobtainable at first, don't shut your eyes to the proposal of exploring new genres. sometimes a predismissal of certain books can prevent us from expanding our horizons. let's restart with a clean slate and find you a book that feels unobtainable now but could soon be a favorite.")