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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.
I think there isn't a search option to filter by clan. The only way I could find is viewing user profiles or seeing the followers/following list of the profiles, if a user is in a clan, it will appear in one of the list columns...