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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.
19th test is
[2,2,101,2]
and the last digit is 6: https://www.wolframalpha.com/input?i=2%5E2%5E101%5E2You can print the input array to see what tests pass to your solution.