A high school teacher in a black coat enters the classroom. "Good morning," he says to the students before starting his lecture, with his right hand busily scribbling something on a blackboard and his left holding a physics textbook.
Then, while holding the chalk and the textbook, he points at a female student and asks a question. The student answers.
"OK, that's correct," he says, giving her the OK sign with his third hand.
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