I agree? In the above I'm assuming equal likelihood between each lab and each city, rather than equally likely to have come from any lab vs any city. The seco

I agree? In the above I'm assuming equal likelihood between each lab and each city, rather than equally likely to have come from any lab vs any city. The second is a poor starting point as it suggests having two, 100, or 1M labs would mean no increased chance of coming from a lab vs 1 lab. That's why I suggest the first.