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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 care with this one. You should use .equals("needle"). And when u change it, it will throw nullPointer, 'cause you're not validating nulls in the array.