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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.
Totally agree with you @brendanvos Your description is definitely clearer and should be adopted as the official one.
I totally missed this part «each digit of n is either equal to or larger than the previous digit (when parsing n from left to right)».
Thank you!