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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.
Reference solution was buggy and returned wrong expected result for integer=2. Should be fixed now.
Can you post your code, so i could use it to reproduce and fix the issue?