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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.
When intitially signing up it prompts for developer level, though is does not for each language/syntax you select. There may be some languages you are senior at and some you are new to but want the practice tests.