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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.
Yes, I just updated the phrase of the wording in the description. Hope it's more clear now.
Fow others who run into this (and maybe to be added to the spec): if both string and symbol keys are present, only update the symbol key.
I'm running into this same issue. Were you able to figure it out? This kata appears to have some serious issues in terms of unclear specifications.