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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.
yep, but if you've already mastered all the logic behind the simple permutation, sometimes using a stl function would come with less TC compared to coding on your own. This solution provides some insights with me, though I still deem it cheating XD