Please, How to reset programming assignment in week 2?

Location:
week 2, Programming Assignment, Gaussian elimination.
Description:
i deleted cells and modified some places. how to reset as beginning.
Thank you for helpful

This should be on the top right-hand corner (it usually is), close to the submit button. Here check this link for detailed instructions:
https://www.coursera.support/s/article/360004995312-Solve-problems-with-Jupyter-Notebooks?language=en_US

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Delete your current notebook file (via File->Open), and then get a fresh copy (Lab Help, “Get Latest Version”).

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