Thank you for your contribution @duski.harahap.
After reviewing your contribution, we suggest you following points:

• Very interesting and well explained tutorial. Good job.

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

• In the sections of your code please ident the code.

• The GIFs showing the results look great and the reader has a better perception of what you are explaining.

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

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