Chatbots ___________ on the internet for many years, have existed, have been existing, By 2017, over 30,000 chatbots ___________ by over 100 million people, had used, had been used, The earliest chatbots ________ for fun by programmers with no commercial plans, were developed, developed, The responses of chatbots ________ on the conversations of millions of people, base, are based, Today thousand of companies __________ them to give advice, use, are used

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