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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.
My bad, yes it is working fine. I just misread the error message on test case, adding the zeros did the trick.
Is Java version borken?
Test case just says "begin 0, end 8, length 1"
and I return "128.114.17.104" what seems to be the correct answer