Exercise: Generalized find the odd value

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• Given a list of values, we know that every value comes in groups of N except one group that has less than N element. Given the list and the number N find where it starts:

• f(["a", "a", "a", "b", "b", "b", "x", "d", "d", "d"], 3) would return 6
• f(["a", "a", "a", "b", "b", "b", "x", "y", "d", "d", "d"], 3) would return 6

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