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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.
o come on man !!!
your code is definitely wrong. if you golf a bit less then you'll have room to insert print calls to find out what happens.
maybe the test output is confusing though.