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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.
It's not a kata issue, your solution is too slow. You do not need to count all elements, you just need to find out if there's more than one. Additionally, you count elements which you've already counted.
Just think of redundant computations you're doing.