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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.
i guess underscores are allowed everywhere in the username, not just at the beginning.
Just a guess, but "markers" can actually be more than 1 character.
Sadly this does not explain the error completely cos' you do escape the markers.