FisherFixedArity

A model without an explicit Poisson node, and with a fixed number of k=4 dilution stages. Each stage dilutes to 50% of the previous concentration. For fixed arity models, tuple representation works reasonably well. See other, more general models above.

This model was created as the first approximation. It is arguably very simple, but also very ineffective (too few stages for our ρ0)