Better than all previous non-cheat solutions :-)
The function 'unique' should probably also be prohibited.
Strictly following the problem statement, this should pass?
This also does the trick :)
How to find the position of an element in a vector without using the find function
letter yes yes & letter no no
Find nth maximum
Area of a disk
Separate even from odd numbers in a vector - with a loop
Horizontal matrix sort
Add a vector to a matrix
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