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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.
There is no need to make it so concise, it will be compiled in the same byte code as less concise but more readable code
You should use StringBuilder when building a string representation of a number