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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.
Seems to be specified now. May not have been specified then.
Still has not been fixed.
This comment is hidden because it contains spoiler information about the solution
The instructions need to be more clear. I didn't know I couldn't use Math.sqrt until I looked at the comments.