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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.
There are numerous examples and multiple natives speakers confirmed me it is perfectly clear that way.
This honestly should be clarified in the instructions. It's been asked about multiple times in the discussion and threw me off when I read over the instructions too.
Not biggest number.
once you cut a 14x14 square into the 14x20 rectangle, only 14x 6 is remaining. How do you plan to cut a 9x9 square in it? ;)
EDIT: btw, think about the spoiler flag when you post code.