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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 think it's possible for valid solutions to be invalid if this happens:
"these solutions now no longer pass"
Just tried and the solution did pass (since it's almost the same as the valid ones).