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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.
As you could have seen at the top of the page 1,691 guys out of 11,272 passed the Java kata. The tests are the same in all languages. Issues are for errors in the kata not in your code.