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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.
None that I know of. Check the stats -- there are 577 solutions here that are passing on Java. So, unless you can demonstrate otherwise, problem is likely your code.
In what language?