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Python > Logic-2 > lone_sum
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Given 3 int values, a b c, return their sum. However, if one of the values is the same as another of the values, it does not count towards the sum.

lone_sum(1, 2, 3) → 6
lone_sum(3, 2, 3) → 2
lone_sum(3, 3, 3) → 0

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