It would be beneficial for the problem if zeros were added to test cases, for example [...,1,2,0,-1,-2,...], [...,1,2,3,0,2,3,...], [...1,2,3,0,0,0,1,2,...], [...,1,2,0,0,-1,-2,...], etc.
Additional test cases have been added and the description slightly modified.
Which values occur exactly three times?
Length of the hypotenuse
Hard limit function
Pernicious Anniversary Problem
the number of inputs
The Matrix Construction
stem and leaf plot
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