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Language/Type: Python list mystery lists

Consider the following function, mystery.

def mystery(a, b):
    for i in range(len(a)): 
        a[i] += b[len(b) - 1 - i]

What are the values of the elements in list a1 after the following code executes?

a1 = [1, 3, 5, 7, 9]
a2 = [1, 4, 9, 16, 25]
mystery(a1, a2)

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