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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.
Speedvice and memoryvice this is the best solution, since it is independent of how big is the input. It doesnt need to iterate over integers, or store anything.