copy of Problem 63.
Number of Horns on a unicorn!
Find nearest prime number less than input number
Reverse the elements of an array
Determine the number of odd integers in a vector
Create an n-by-n null matrix and fill with ones certain positions
Concatenate two strings
Find the area of the four walls
Find the dimensions of a matrix
Create the following sequence : 0 1 1 4 9 25 64 169 ...
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