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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.
If you state that a NxN matrix with sqrt(N) = Integer is given, then your test cases should not include examples where these conditions are not fulfilled.