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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.
The description, example, and tests don't make it clear that each consecutive number must be equal to or greater than each previous. I had taken it to mean that they must not dip below the starting altitude. Clarification on that point would be helpful. Maybe just another example like isMonotone([3,4,3]) == false