Variations :
Leaf and trunk color pairs: 5 (+0.5 : two leaf color types if the trunk color is yellow)
Quantity of leaves
Thickness of trunk

The color of the trunk and leaves varies slightly depending on the variation.

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Key Input:
s: screen capture (.png)
c: Color mode change (there are three, toggled each time c key is pressed)
x: Drawing of twinkling stars (ON / OFF)