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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.
Very Clever!
This comment is hidden because it contains spoiler information about the solution
Little slowpoke, but I've just made this kata and saw your comment. Your solution does not work because your thickness equals 0.001 instead of 0.0001 (one 0 is missing).