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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.
It seems like there is some problem with the fruit strings not being recognized as instances of String and therefore it is not possible to use .toLowerCase() directly at the moment.