In view of the recent spate of trivial problems with no test suite to speak of, thanks for making the effort of providing a proper test suite and a slightly less trivial problem.
Which values occur exactly three times?
CONVERT TAN TO SIN
Matlab Basics - Pick out parts of a vector
Calculate volume of box
Matlab Basics II - Extract last 3 elements of a vector
Finding an element in a vector
Matlab Basics II - Determine if an array has a 3rd dimension
Matlab Basics - Set unwanted parts of a vector to zero
Matlab Basics II - Minimum
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