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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.
wow! adding "_" to s at beginning is really smart! so we don't need to check if the s.length() is odd or even. Thank you for your solotion. It's easy to understand.