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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.
This doesn’t satisfy “An invalid program should raise a type error rather than a runtime error.”
awesome kata, and to understand why those type signature work is more difficult than implement those function