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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.
About your problem, see the last example in the description, the delimiters can be mixed, not only of one kind.
That was a warning about a method deprecation in the solution's code, updated the method, so the warning doesn't appear anymore.