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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.
its said that u don't have to worry about strings with less than two characters...
goodluck xD
You can also simplify ur code by deleting 9 string and adding in end of func "return 4"
So good bro