Instructions:

Note: When you increase brush size, you must reselect your brush.
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1 for regular black brush.
2 for regular cyan brush.
3 for regular yellow brush.
4 for regular magenta brush.
5 to erase.
6 for random shapes brush.
7 for scatter brush (color matches last color used).
x to clear, p to save image.
Use , and . to increase or decrease brush size (must hold down mouse to work).