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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 didn't even know str_split and strlen could be applied to an int, that's smart. PHP is always surprising.
Well done, precise and readable.
It didn't - it's still there in "Past Solutions", when you go back to the task.