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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.
Clever. Caching a large range of computations and then using it over multiple requests. This efficiency rests on the assumption that the cache will persists from one call to the next.
The other downsides are that it is overkill for small ranges, and does not cover larger ranges.