Enter mathematical operators to find a valid equation

The Task

Change each question mark into a mathematical operator so that the total matches the value after the equal sign. The use of parentheses and more advanced operators such as exponents are acceptable.

3 ? 6 ? 8 ? 1 ? 1 ? 1 ? 1 ? 9 ? 4 ? 4 ? 9 ? 8 ? 6 ? 4 ? 8 ? 1 ? 9 ? 5 = 68

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Follow-up

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