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"hard": ["ChatGPT", "artificial intelligence", "time travel", "gravity", "the internet", "machine learning", "a computer dreaming", "virtual reality", "a robot learning to paint", "privacy", "algorithm", "climate change", "teamwork", "a password", "information overload", "a glitch in reality", "an invisible friend", "a rumor spreading", "a smart home", "a camera recognizing a hand"]