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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.
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No. It's the angle between each side you have to sum.
The test cases check your code for banned letters like it would do your mother ( using her eyes simply ;P ).