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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.
It's good, but I would also recommend inserting "return new int[] ..." after each "if statement" so that the computer does't have to check the remaining "else if" e.g. humanYears == 1, computer checks the first "if" and then program terminates.
What's more, remember about error handling - in case user gives humanYears < 1.