The classroom item is this: (the last practice lab)
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I am on exercise 3, I have followed the hints very closely, but the code just refuses to produce understandable answers. What should I do?
Perhaps you have forgotten to run previous cells on the notebook! Try Kernel → Restart and then start running the cells from the beginning.
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it’s not such a big issue, just run all the cells from the start, it may solve the problem
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