Create a cell array of strings containing the first n natural numbers. Slightly harder than it seems like it should be.
>> y = naturalnumbers(4)
'1' '2' '3' '4'
Implement a ROT13 cipher
Prime factor digits
Find the sum of the elements in the "second" diagonal
Matrix indexing with two vectors of indices
Given a 4x4 matrix, swap the two middle columns
Split a string into chunks of specified length
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