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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.
There are 2 things you can look into. Currying which allows you to pass in multiple seperate args, however due to this problem giving an unknown number of args, maybe try solving it using classes instead.