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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.
There's an issue with empty vectors, easy to fix by moving "-1" to the left in the condition.
This doesn't seem to be correct. Consider "cd" and "be" strings. Plus it's easy to overflow the sum.
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