Solutions for Additive Persistence
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This challenge requires you to continually add up all the numbers in the parameter until you reach a single number. For example, if the input is 2718, then you add up 2 + 7 + 1 + 8 = 18. You then do the same for 18, 1 + 8 = 9. When you reach a single number your program should return how many times you had to add to reach it. For 2718, your program should return 2. We'll solve this problem by recursively adding up the numbers in the input.

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