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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.
How to handle the capital letters is contradictory.
I think that if you keep track of the objects you already froze yourself, you can fix the case where there are already frozen objects with non frozen children.