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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.
You don't have to calculate "x * x" and there is no need for BigInt.
235 guys passed the JS translation without BigInt. Try to use the Hint.
Can't you use a library?