Complete the following recursion exercises on codingbat.com:

• factorial (just for warming up)
• bunnyEars (NB: do not use multiplication!)
• triangle (again, multiplication is not allowed)
• sumDigits

Then, modify the Tree example by adding a leaf (that is, a small green circle) at the end of the branches. I got a nice effect using a fill(200, random(0,200), 0, 50); and no stroke, with an circle diameter of 15. (What would this look like? Ponder before trying it!)

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