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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.
This is a correct answer, but overly verbose since it is pointless to return true or false on a condition that already returns true or false.
Really like this answer, nice one.
if-not or not= might be more idiomatic for your sq-in-rect. Better yet would be a when-not since your topmost if in sq-in-rect doesn't have a second branch.