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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.
You may want to change this to contains a string of letters being bad. Using whole words in the example test makes it rather easy to solve.
I know this isn't ideal, however my test would not allow it through without the echo showing both quotes.
You can skip setting s as the variable and call it directly in the echo for one line less.