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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.
Judging from the comments (and me being stuck with my own simple solution for the global maximum), I'd suggest amending the description with a longer example, because a simple solution for the small example pyramid works, yet for a bigger one does not, leading to the (repeated) question about said maximum.