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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 consider the sum it should be zero, if you consider the problem of reducing fractions when there are no fractions... that doesn't make sense so return nil. I considered the problem of reducing fractions, maybe I was wrong.
Of course, but I don't see such a solution.