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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.
Your input "Hi (there)" is not valid input for this kata. Input consists of only ({[]}) characters
It does work - it passes the Kata tests. The Kata description could probably have been more explicit taht the string will only contain the characters '(){}[]'.