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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.
After first call newAList.RemoveAt(i); lengths of array a and list newAList desync which is a problem because you trying to remove elements from list newAList by indices of elements from array a.