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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.
awesome, works perfectly now. no need to change Int for Double :)
This kata needs to be fixed for Swift, using Double instead of Int in declarations, otherwise is impossible to pass the test cases.