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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, I've upvoted it because the thinking behind the algo is very good, but I note that this solution is very very slow on large number (try to check(123456789).
(NB : replace xrange with range for python 3)
Beautiful