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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.
Java: doesn't work for IntUnaryOperator
It is bad practice to name variables name from upper case letter.
You really don't need additional cast here. It is redundant.