The test suite does not check that the solution is a character string, but the problem definition requires that it should.
Added this check. (I messed it up a bit the first time I tried to do it, so sorry for some interim weirdness.)
str = num2str(A,formatSpec), could replace '
Invalid solution, really
New test suite invalidates this solution.
Implement simple rotation cypher
Change the sign of even index entries of the reversed vector
Return 'on' or 'off'
Return area of square
Cull vector elements that contain a specified digit
So many choices
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