The title and description of this problem have been cleaned up. Also, its test suite has been expanded and improved.
So many choices
Duplicate each element of a vector.
Determine the square root
Concatenate two strings
Count given word x in text.
Convert array of decimal numbers into binary numbers array.
For given xx,x, y vectors build spline of x and y and find yy values for xx vector.
Delete x value in given vector y.
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