Your college professor began his lecture. This week's topic was now front and center. Students prepared to take notes as the presentation. As usual, the topic was about calculus, considering that he teaches that subject. Some looked ahead to a pop quiz. Others wondered what the homework would be. He spoke with authority. Olin presented the info in a clear way. Examples could come up to explain hard concepts. This helps the students learn and keep up. Nothing too ordinary, right?

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