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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.
I like this :) Short and understandable for a noobie like me.
almost the same as mine
if you treat duplicates as a set you can remove the second condition because if you see a repeated value, the size of the set remains the same instead of skipping over it (your solution).