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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.
The description lacks any meaningful specifications.
No random tests.
This comment is hidden because it contains spoiler information about the solution
Needs random test cases
Needs more examples and test cases. Also, instructions need to make it evident whether this array is only of primitive types and strings or whether it can hold other arrays, objects, etc.
Duplicate of http://www.codewars.com/kata/remove-duplicates/discuss.