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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.
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Or you can be really stupid and do what I did which isn't clever at all but still works.
There aren't any modules you need to import. However, you need to find a common property shared by all the numbers in order to use something other than subtraction to get your answer.
I guess this Kata has to import some modules.
With only the bulit-in module, it will be impossible to finish in time.