I accidentally cancelled all the cells in week1's assignment, how can i return it, I tried reboot but failed

I accidentally cancelled all the cells in week1’s assignment, how can i return it, I tried reboot but failed
its now nothing on my jupyter notebook

Open the File menu. Select Open, then click the box by the file name and click on “Delete”.
Now go to the Lab Help menu (it’s the question-mark inside a circle), and use the “Get latest version” tool. This will give you a new copy of the notebook.

Then refresh your browser, and use the File menu to Open the notebook.

Thanks! It works!!!

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