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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.
Use regex and not a kata issue
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For this you could just use the a.strip method. I wasn't aware of it until I did moe digging throught the documentation..