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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 did the same, but I also know how to implement it with trial division. I've noticed a lot of the ruby challanges on here lend themselves to clever solutions with some digging around in the ruby docs, which is a skill in itself.