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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.
Gotta agree here, as someone who isn't completely sure what +- or -+ mean in the first place, it is unclear that -+ is invalid as well. Same goes for the rules on the < and > carets—need to look the rule up or make deductions since it's not completely clear in the statement.