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.
Find relatively common elements in matrix rows
Divisors of an integer
07 - Common functions and indexing 1
construct matrix with identical rows
Factorize THIS, buddy
Maintain shape of logical-index mask
So many choices
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