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.
Back to basics 4 - Search Path
Number of digits in an integer
Area of an Isoceles Triangle
construct matrix with identical rows
Factorize THIS, buddy
Figurate number triangle
High school cafeteria
Increment a number, given its digits
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