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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.
I pass all JS tests ("Submit" fixed tests + random tests) in 190 ms.
Which language? Seems that there are problems at CW. I timed out constantly these days translating some katas. Maybe you could try later...