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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.
Yes, he alter the order of the input.
Maybe it's caused by the bug of the tests...
this is not correct.
will return 900, but the correct answer is 500