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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.
Take first element and throw out in other list, skip second, take third and skip fourth. If you reach the end of list, then go back to the start and go ahead, considering the result of taking/droping of last element (if you dropped, now you take and backward)