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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.
How does the encoder is this kata is supposed to handle special characters?
According to base64 index table the only special characters it contains are + and / yet in kata there are tests with other special characters like - .