Contributing to solutions? (searched, but old links are broken)

I’d like to contribute a set-based solution to this page, but can’t figure out where to go. Searching the forum, I found this link, but the only answer as far as the “guide” folder 404s. I’ve tried grepping through the monorepo, but haven’t been able to find the right file there, either.

So, where does the source for this hint/solution page live?

The hint/solution for this challenge is here under the Guide category on the forum. In the near future, there will be a new release to production and the Get a Hint links will link to the corresponding forum topic with the solutions. We are still ironing out the exact process of how these topics will get updated, but we will have the contribution documentation updated upon the next release.