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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.
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The question was alrady answered by dcieslak.
I worked way to long at this kata. Now it is clear of course, two days ago I must have mixed up left side and right side. thanks for the explaination!
I don't understand why 'jztwj' should result in 'left side wins!', when a letter with adjacent letters j and t is not converted.