This appears to be duplicating an error in the original Problem: according to the problem specification, having an input of  should yield a result of "false", as there is no OTHER element to compare the 1 to! You can easily fix this inconsistency by either --- changing your problem specification (mention that you can compare to all vector elements, not just the 'other' elements) or --- by changing the correct result to "false" in your Test Suite.
Please check comments made about the original Problem to avoid duplicating errors or inconsistencies.
Which values occur exactly three times?
Pi Estimate 1
Vectors counting by 2
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