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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 like your practise, but I think, especially in work ground, that variables names should define what they have inside. Yes f are simple, but it doesn't mean anything for next person.