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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.
There should be fixed tests with
$n = - 2^{4k+3}$(-8, -128, -2048, ...)Sample tests are set up incorrectly.
Just run them to see what's wrong. You should have done this before publishing anyway - test your stuff!