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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.
Not my issue if tests cannot enforce the rules. Go raise an issue at the kata about it (though I'm pretty sure it's already done).
"the function cannot use, in any way, the original split or rsplit functions"
Doesn't follow the rules.