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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.
After solving (in my opinion) this puzzle, I get the same error from a test case of the "Attempt" submission.
I also think the correct answer for the test case :
is
3, for 3 years.This test case is similar to the one given in the kata's description and this description itself proposes
3as the correct anwser. I completely agree with the demonstration of @uslu.