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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.
Ok I guess this means the task doesn't have test cases like abc999999999999999999999999999
Yeah I was wrong. It's not BigInteger not working, it's their information about their tests that was weird
java.math.BigInteger doesn't seem to work on this machine here