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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.
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Calculating large determinants by Laplace's formula isn't smart either, yet it is fine enough to solve this kata.
There are other kata that require runtime efficiency and consequently have a higher kyu.