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\sum_{\rm particles} J x_i \rightarrow \sum_{\rm grid} J_{ij}.  \end{equation}  {\it Question 3:} Random energy wells with some distribution of depths: what clustering statistics would this lead to? What distribution of wells gives a fractal distribution of clusters? Master equation approach:   \begin{equation}   \frac{\mathrm{d}P}{\mathrm{d}t}(C,t) = -\sum_{C^\prime\neq C} W(C\rightarrow C^\prime) P(C,t) + \sum_{C^\prime\neq C} W(C^\prime \rightarrow C) P(C^\prime,t)   \end{equation}