With a linear algebra library, you can guarantee that you've found the next, or the previous, match in sequence. I don't know what the state of the art is for fast linear algebra in javascript, though.

(The matrix approach also has the advantage that, when your full-text search problem has 2^115 solutions, you can compute the one you want, the next one after some index, without having to compute them all.)

very fun to have received so many pointers here, hopefully I'll be able to do a follow up blog once I've finally let people find all the good UUIDs