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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.
For those wondering what the definition of a peak is in this question (which could be more specifically notes):
The values immediately left and right of the "peak" have to be less than it.
The plateau description is fine.