cleanF14 := (x^2+x*y-y^2+1)^4*(x^3*y^2-2*x^3+y^2-2)^3*(x^3-y^3-3*x*y^2+2);
noiseF14 := `*`(1/100000000,-4-2*y+3*x^2+4*x*y+4*x^2*y-3*y^3-3*x^4+4*x^3*y-x*y
^3);