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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.
It's a CW problem not a kata problem. 643 guys passed the Java kata. Be patient until CW goes better.
Moreover don't post an issue when you ask for help.