IJN says: > Then you just have to figure out what 3 weighings will do that (leave the trace) for you.
Sorry - being silly. As I said I've seen better writeups on this approach but this is what I could find in a hurry. All the ones I've that start down this road rely on that base-3 counting up to 27 somehwere or other. Maybe you can come up with something new based on the signature trace idea. I doubt the field is exhausted ;-0