y, x, 
(x-1)*(x-2)*(x-3)*(x-4)*(x-5)*(x-6)*(x-7)*(x-8)*(x-9)*(x-10)+1/100
((x-1)^2+(y-1)^2-2)*((x-2)^2+(y-2)^2-2)*((x-3)^2+(y-3)^2-2)*((x-4)^2+(y-4)^2-2)*((x-5)^2+(y-5)^2-2)+1/1000
