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    Can you provide the details of your test case? What were the input values?

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    i'm coding in the golang version and i'm sure there's something wrong with one of the tests

    given that the lower bound is 100000 and the upper bound is 12345678900000000, but somehow the answer is only 718650, which from what I calculated is way less then just the total for a 16 upside-down number sum. So, now im also wondering if actual tests are correct or not.