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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.
Its a good kata. There is different ways to solve this, some easier then others.
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I used way to long for this, Overthinking it. Its natural i think to complicate things more then it needs to. Its a very simple solution, it might take you some time to solve it, but its a good practice.