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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.
I had the same issue but I changed sizeof(arr) to arr.size() and it worked.
even i have a habit of using re for substitution, its better when you want to substitute symbols, numbers or any other criteria