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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
May depend on what version of Python you're using. 2.x and 3.x treat division and floats very differently. Look into floor division if you're using the latter.
I wrote my solution in C++. I also worked with the length as an odd number first and had a similar issue. When I switched everything, and checked for even lengths first, it seemed to solve the issue. Hope this helps.
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you should add this to your portfolio