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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.
Here is some bug, because I have 3 error that 729 should equal 7625597484987 it is x=3 y=10 , I checked it in other ide and my solution works ;) And rest test pass :P