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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.
If you have to restrict valid language features, your task may just not make a good kata. Other opinions may be available.
Restrictions have to be done carefully, very carefully, and may make translations difficult or impossible.
this is insufficiently specified. It is unexpected we have to return a different string than the input.