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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.
But you passed the kata!
That's a question, not an issue, a plateau is a group of repeated values next to each other, see the examples in the instructions, they can be or not a peak depending on borders conditions.