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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.
In your description you state to find the numbers whose multiples are being replaced by Fizz and Buzz. But one of the sample tests is Test.assertDeepEquals(reverseFizzBuzz([1,"FizzBuzz",3,"FizzBuzz",5,"FizzBuzz"]), [2,2]), I would expect the result too be [0, 0] as neither Fizz or Buzz are present in the array.
Is the description incorrect or is it the tests?