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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.
Nice catch, I just got rid of it.
Thanks, I'm glad someone found this kata useful :D
I just took a look at the random tests, and the rows are all working properly. Hmm...
grouping is pretty usual to "spell" the numbers in pairs