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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.
Same here -_-
If you read the last line of the description: "NOTE: reverse/reverse! have been disabled for String/Array and reverse() for JS.
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If the radius of a circle is > 1, coordinates on the circle can be greater than 1 or less than -1.