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?
middleAsColumn: Return all but first and last element as a column vector
Determine Whether an array is empty
04 - Scalar Equations 2
Matlab Basics - Convert a row vector to a column vector
Vector to 3-Column Matrix
stem and leaf plot
Matrix Construction I
Image Series 3 Complementary
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