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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.
For everyone misunderstood kata:
You have to square EVERY digit from the number - not whole number!
The sample test is wrong and suggests we have to square the whole number - correct it please :)