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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.
See hobosky issue below, it seems part of it wasn't resolved.
The random tests are making problems some times it expects 18 and the actual result is 9 (I think this is appropriate) and some times it expects 9 in case I change the "magic number" to 18. My solution passed on random generated value but please fix the tests. Thank you.