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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.
I can't unless you publish it here: is so, don't forget to use the spoiler flag.
But my advise would be to use for loops on a first version, make it pass the tests then try to peak other solutions and to integrate recursion in yours.
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Not a issue, simply optimize your code.
They aren't random but there are here, but sure it lack random ones.
Sad that noone tried to golf it in JS :/
Nice kata, 92 seems easy enough compared to other one-lined tasks ;-)