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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.
From an API design point of view I'd argue that PaginationHelper is poor. If you were dealing with pages would you really want to work with an API that says Page 1 has an index of 0? Zero indexing is an implementation detail that shouldn't have bled into the API.