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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.
I feel that the description regarding how to round double numbers are not clear. I cannot pass all the test, some of the results are 1 higher or lower as expected. This is the only problem, anyway its a good excercise.