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Convert the following sentence to past tense. | She walks to the park every morning. | She walked to the park every morning. |
Summarize the following text. | Artificial intelligence (AI) is intelligence demonstrated by machines, in contrast to the natural intelligence displayed by humans and animals. Leading AI textbooks define the field as the study of 'intelligent agents': any device that perceives its environment and takes actions that maximize its chance of successfully achieving its goals. | Artificial intelligence (AI) is the demonstration of intelligence by machines, involving devices that perceive their environment and act to achieve goals. |