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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.
In JS, the large number tests are making it impossible to solve, I think. For numbers like 589 they get so large that the product is just (1312312313xE^24) or something like that and it can't be parsed.
There are literally no instructions. You have to look at the tests to discern how to write the solution.