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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.
Depnds on the data.
Think what happens when adding cats or schools which are not related (yet) to a senshi.. you would end up with records without senshis name, which does not fuflill your requirements.