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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.
Plese read the posts below before posting. Some guys had the same problem as you. Be sure that all tests are correct:-)
test cases are wrong: [307, 317] should equal [337, 347]