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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.
seems the test case is wrong.. I'm having the same issue someone had 4 months ago.. why is this not fixed?
The second test says "should return [0,1] for [0,1,2,3]" yet this kata is supposed to be pulling out only even numbers..