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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.
That seems like Fopnovals was mutating the input array.
The test out put can be very odd at times, it doesn't always show you the actual input that the function is running on. The hidden tests also do odd things like not mentioned in the description, edge cases are very common.
I think this test has unresolved issues.