If you really want help with this problem, put together a small test suite that gives some inputs and some sample outputs (that you tabulate by hand) and wait for someone to produce a MATLAB function to do what you want.
This is an interesting problem. Acting as an administrator, I cleaned it up and added some tests.
Construct a string from letters and counts
Make a random, non-repeating vector.
Convert from Base 10 to base 5
Permute diagonal and antidiagonal
Given area find sides
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