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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.
The random tests in JS are not broken. I solved it. So they are not broken.
As myjinxin2015 said: If you change the array, it could lead to problems.
it seems that you modified the input array.