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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.
Fantastic kata, probably my favourite so far. I'd be tempted to rate it kyu 3 though; this is tougher than most of the kyu 4 that I've seen.
Same error here, also in PHP.