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I´ve tried to do it manually to n=15(like spiral 15x15) but it got messy when n=12 and more.
Sample of what goes messy is what is interesting.
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How to make inside of the spiral pattern
Advice:
- Use a 2D array where you draw the spiral then print the array.
- Fill the array as you would draw the spiral with a pencil.
This way, you will print any thing, no matter how complicated is the drawing.