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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.
Couldn't it happen that the year was 0001?
This error refers to the testMatrix2 which should output expected2. It's the second test, so maybe you should check if your function works properly when called multiple times.