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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.
In the Java testcases, the expected and the actual are swapped around, so your solution is returning 15 and the expected answer is 6.
test cases seem wrong
expected:15 but was:6