Project Euler #206: Concealed Square

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    You could try doing some test cases by hand with pen and paper, a bit like you would normally solve challenge #96 :-)

    Don't try large test cases by hand though, as there are still quite a few possibilities to try; instead try turning your manual method into code.

    This isn't as hard as #96, yet I had to revise or improve my approach twice to get all test cases sussed.