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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.
Actually underscore _ represent first argument but not using it. It's indicate does not have any significance at all.
Further references
https://stackoverflow.com/q/27637013/12020032
Bravo...