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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.
For python, this is a poorly worded kata. It has an input named iterable which imo is bad practice. Then, the sample expected input is a string in the sample tests, though when you go to submit, it tests for char arrays, int arrays, and for a string.