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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.
Different mistakes (inital code, tests, ...), yesterday someone published prime kata #99?, this one is #100? No new ideas? Too much work to search for "prime"? To much work to look into the testcases of other katas before, just publishing "something"? It's a duplicate...