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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.
Your functions should return in CW instead of printing the result, you should know that by now, don't you?
This kind of strange results may be due to "invisible" spaces. Are-you sure there's no spaces around your 'H'-result ?