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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.
How about to let the functions return (sums mod 1000000000 [one billion]) or something alike?
That is how the 'big numbers' are checked as answers at projecteuler.net.