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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.
You are not tackling the problem correctly.
The fact that the half of the length of the array equals the size of the set, doesn't mean that every number in the set occurs twice.
I can not say too much. I can only say that this can be logically inferred. ;-)
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@micos7,
Thanks for your nice image ;-)
I've added it to kata's description.
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Compared to many of the other level 8 Kata this one is much harder you are absolutely correct. This is what the community ranked it not me. Codewars in general has become much tougher and you will see it reflected in the Kata ranking. I think it is the result of having some really great coders as moderators.