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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 suggest amending the instructions to clarify what is meant by 'sequence' by saying the input is either a string or an array. I'd also do a test case where an array of mixed types is passed in.