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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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According to description everything is okay, what i mean is array difference sounds like a different thing, anyway thanks :)
I don't think that the array difference of [1,2,2] from [2] is [1]. [1,2] seems the right answer? Am i thinking wrong?