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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.
The example test cases are only a subset of the actual test cases, i.e. if you submit your solution, more test cases will be executed. Maybe your solution might have a bug.
Nevertheless, it will be very helpful if you can post some error messages.