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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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It would have been harder if it was allowed to put ships next to each other like, determining if it's a battleship ar 4 submarines next to each other.
That's way alot of work :)
Math.sqrt is already rounded.