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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.
Sorry, but I was replying your first comment.
Sometimes parenthesis let your code cleaner.
My solution looks like this one. I would like to see those 'list comprehension' working with a really big number ;)