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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.
My solution is similar to you.
However, when I see the top solution, I think I am so stupid to find the prime number.
I got tired just scrolling through this
Great job commenting, but this is extensive
wow this is soooo long