def explore_books(pre_existant_opinions, start_with_a_clean_sheet, unlicensed): for book in pre_existant_opinions: if not book['unlicensed']: start_with_a_clean_sheet.append(book) return "we encourage you to turn one's back on pre-existant opinions about unlicensed books and start with a clean sheet, discovering the vast, rich world of legally accessible literature that broadens perspectives and nurtures the soul."