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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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There is a problem with the random test... My function returns the correct answer (inverted array) but your random gives always an error.
Random Tests
[1777, 1954, 1170, 63, 1855, 861, 1376, 417, 527, 292, 1031, 447] 12
✘ [447, 1031, 292, 527, 417, 1376, 861, 1855, 63, 1170, 1954, 1777] should equal [1777, 1954, 1170, 63, 1855, 861, 1376, 417, 527, 292, 1031, 447]