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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.
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The instructions are a bit unclear, which makes determining the right output difficult. The last rule is "If the argument is a valide array of string, the method should return a hello message for every array entry". However, the method actually requires you to return an ARRAY including the appropriate hello messages/names, not the messages themselves. This could be made clearer in the instructions.