Please add more cases to the test suite, or else it is trivial to solve this problem.
Rafael is right and since you made this into a badge problem it is even more essential to fix this
Which values occur exactly three times?
Project Euler: Problem 6, Natural numbers, squares and sums.
Get the length of a given vector
Convert yards to feet
Find Logic 14
Find Logic 29
Find Logic 27
Find Sum of array
Find Logic 11
Find Logic 7
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