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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.
Have to agree with kgashok. Having it return arrays with 1s cuts against the logic of this kata
Third test case on Ruby seems to have an issue
Instructions could be a bit more detailed, specifying that arrays are of same length, for example.