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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.
Sorry, not best practice nor very clever; if negative numbers are in the list this will crash terribly.
And allocating so much memory might work on CW platform, but is not portable at all.