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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.
Nope, it is your (the kata author's) job to reject any solutions you dont want them to pass by your test code.
Otherwise, any solutions that pass are perfect.