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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.
You solution is great. But I'm more prefer with how binary working in computer system.
regex is my weak point :(
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Sigh, I need to paractice a lot to get this level :|
OMG!!!
I write 13 lines to achieve this.