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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.
won't work with inifinite iterators
iterable could be infinite, so ToList() makes no sense
Pure nonsense
To add to the comments above, would also fail for a simple list of { "abc", null, null, "bcc" }
Iterable solution makes no sense as best practice here