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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.
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You should make them keep the negative number of a negative fraction in the numerator. I did that and got confused when it wouldn't work on my attempts. I did the solution in haskell, and in that version of the problem there was no mention on where the negative sign should be placed or if it should be placed in a specific location at all.