Additional test cases have been added.
Calculate the Levenshtein distance between two strings
Compute a dot product of two vectors x and y
Remove white space from the string
Return 'on' or 'off'
Symmetry of vector
Combinations without using nchoosek
Get the elements of diagonal and antidiagonal for any m-by-n matrix
Return unique values without sorting
Sophie Germain prime
Angle between two vectors
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