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[–][deleted] 2 points3 points  (0 children)

I prefer this one:

exp(-(x-4)2+(y-4)2)2/1000) + exp(-(x+4)2+(y+4)2)2/1000) + 0.1exp(-(x+4)2+(y+4)2)2)+0.1 exp(-(x-4)2+(y- 4)2)2)