In addition, we did not find the algorithm to be sensitive to initial site selection. We consider scenarios of 20,50,100,200,500 and 1000 arrays optimally placed by the greedy algorithm for the two threshold M2 current amplitudes. We do not assign particular timescales to such development, but is likely that the 20 array scenario could be achieved within the next decade, and the 1000 array scenario possible by the end of this century.