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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.
this is cool, but it seems it doesn't meet the latest requirements of the kata. this solution would consider the string ")()(" to be balanced.
I certainly agree this is clever, but best practices? It's relatively obscure code...