Thank you for your contribution @duski.harahap.
After analyzing your tutorial we suggest the following points below:

• Nice work on the explanations of your code, although adding a bit more comments to the code can be helpful as well.

• Using GIFs to show results is definitely better than standard still images. Good Job!

• Again be careful how you write the tutorial.

Thank you for your work in developing this tutorial.
Looking forward to your upcoming tutorials.

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