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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.
Done.
The tests were looking for string results, which I didn't pick up on at first since the title is "round a number to 2 decimal places" --had to add a line to convert to string, no big deal, but include in instructions?