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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.
What really helped me was thinking about the sorting in stages rather than all at once
Nice! Easy but still learned something about the language.
It has a a lot of tests to stop "banana cheating" but needs some more tests to stop users from cheating the out of order tests.