Thanks. I've updated the description accordingly.

Thanks for spotting that. I've updated the test cases to test solutions for that now.

Yes, of course. Thanks for spotting that. I've fixed the solution now to remove the erroneous square.

I had a little look at this Kata today and have a solution that solves the sample tests fine, but times out for the final tests. I'm finding it a little hard to find the root of the problem, as I'm unable to debug the cases. Any help would be greatly appreciated!