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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.
The "decrypted" result depends on the order of substitution (which is unknown), so the entire kata's premise is flawed.
I don't know much about Java best practices but I believe functions should use interface types for parameters instead of implementation types.
Random tests should be added.