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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.
"input:" and "output:" there were added by NitOwl007, that seems Python and the error message would be like this:
[1, 2, 4] should equal [1, 2, 4, 8, 16]
what language produces such message? it's indeed confusing and could use some improvements.
No, the input is a single number, the first one of those values is what your function returned instead of the expected one (the second value).