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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.
This has been done already. I'll give you I can't find it either, but that's because people don't tend to advertise the solution.
Please specify the output format more thoroughly (if the number of pieces is 1, there should be no 's')
Need example tests
Need random tests