urn is your friend here

I can't view the example patch right now but a quick solution would be uzi 9, urn, thresh, then unpack to each radiogroup. Urn is the main object you want as it does random numbers without repetition. There is probably a better way to handle the routing than using thresh and unpack. The uzi's "done" output can be used to reset the urn object.

edit: now that I think of it I believe urn has it's own output to reset itself.

Awsome. Thanks :)

Something that might be interesting: since it's permutations you're interested in, check out the mxj list package. If you use permutations instead of randomly generating a list, you can always go back to something that was interesting, and you can explore various patterns that are similar. (try using drunk to traverse the permutation index) Just cache the previous value(s) of the permutation index in a coll and you now have a history!

I've used urn in a similar fashion. If you seed urn externally, you can save an reload that seed if there's something interesting. Here's an example of a random counter that uses this idea: